diff --git a/docs/content/dev/ot.md b/docs/content/dev/ot.md
index a1d0bebe..65b7c02f 100644
--- a/docs/content/dev/ot.md
+++ b/docs/content/dev/ot.md
@@ -11,3 +11,10 @@ And even more in this 2010 article series:
 - <https://drive.googleblog.com/2010/09/whats-different-about-new-google-docs_21.html>
 - <https://drive.googleblog.com/2010/09/whats-different-about-new-google-docs_22.html>
 - <https://drive.googleblog.com/2010/09/whats-different-about-new-google-docs.html>
+
+## OT library
+
+HedgeDoc uses a vendored version of OT.js. The source code lives under `public/vendor/ot/`.
+The HedgeDoc frontend uses a minified build `public/vendor/ot/ot.min.js`.
+
+This build is generated by `yarn run build:ot`. This needs to be done after changes to the OT code. 
diff --git a/docs/content/dev/release_checklist.md b/docs/content/dev/release_checklist.md
index d9c52bda..f5567654 100644
--- a/docs/content/dev/release_checklist.md
+++ b/docs/content/dev/release_checklist.md
@@ -52,6 +52,7 @@ To copy this checklist please go to [this link](https://github.com/hedgedoc/hedg
 mkdir /tmp/hedgedoc && cd /tmp/hedgedoc
 git clone -b master https://github.com/hedgedoc/hedgedoc.git .
 yarn install
+yarn build:ot
 yarn build
 cd ..
 tar cvzf hedgedoc-x.y.z.tar.gz --sort=name --exclude hedgedoc/node_modules --exclude hedgedoc/.git --exclude hedgedoc/.github --exclude hedgedoc/.yarn/cache hedgedoc
diff --git a/package.json b/package.json
index 884f39e0..7873d3c7 100644
--- a/package.json
+++ b/package.json
@@ -14,6 +14,7 @@
     "dev": "webpack --config webpack.dev.js --progress --watch",
     "heroku-prebuild": "bin/heroku",
     "build": "webpack --config webpack.prod.js --progress",
+    "build:ot": "bash -c \"cd public/vendor/ot && ./compress.sh\"",
     "start": "node app.js"
   },
   "dependencies": {
@@ -196,6 +197,7 @@
     "spin.js": "4.1.2",
     "string-loader": "0.0.1",
     "turndown": "7.2.2",
+    "uglify-js": "3.19.3",
     "url-loader": "4.1.1",
     "velocity-animate": "1.5.2",
     "visibilityjs": "2.0.2",
diff --git a/public/vendor/ot/compress.sh b/public/vendor/ot/compress.sh
index b7cb423f..6deade9d 100644
--- a/public/vendor/ot/compress.sh
+++ b/public/vendor/ot/compress.sh
@@ -1,4 +1,4 @@
-uglifyjs --compress --mangle --output ot.min.js \
+yarn uglifyjs --compress --mangle --output ot.min.js \
 ./text-operation.js \
 ./selection.js \
 ./wrapped-operation.js \
@@ -7,4 +7,4 @@ uglifyjs --compress --mangle --output ot.min.js \
 ./codemirror-adapter.js \
 ./socketio-adapter.js \
 ./ajax-adapter.js \
-./editor-client.js
\ No newline at end of file
+./editor-client.js
diff --git a/public/vendor/ot/ot.min.js b/public/vendor/ot/ot.min.js
index d942cb5d..81192fc1 100644
--- a/public/vendor/ot/ot.min.js
+++ b/public/vendor/ot/ot.min.js
@@ -1 +1 @@
-function hex2rgb(t){if("#"==t[0]&&(t=t.substr(1)),3==t.length){var e=t;t="",e=/^([a-f0-9])([a-f0-9])([a-f0-9])$/i.exec(e).slice(1);for(var n=0;n<3;n++)t+=e[n]+e[n]}var o=/^([a-f0-9]{2})([a-f0-9]{2})([a-f0-9]{2})$/i.exec(t).slice(1);return{red:parseInt(o[0],16),green:parseInt(o[1],16),blue:parseInt(o[2],16)}}if("undefined"==typeof ot)var ot={};if(ot.TextOperation=function(){"use strict";function t(){return this&&this.constructor===t?(this.ops=[],this.baseLength=0,void(this.targetLength=0)):new t}function e(e,n){var o=e.ops,r=t.isRetain;switch(o.length){case 1:return o[0];case 2:return r(o[0])?o[1]:r(o[1])?o[0]:null;case 3:if(r(o[0])&&r(o[2]))return o[1]}return null}function n(t){return o(t.ops[0])?t.ops[0]:0}t.prototype.equals=function(t){if(this.baseLength!==t.baseLength)return!1;if(this.targetLength!==t.targetLength)return!1;if(this.ops.length!==t.ops.length)return!1;for(var e=0;e<this.ops.length;e++)if(this.ops[e]!==t.ops[e])return!1;return!0};var o=t.isRetain=function(t){return"number"==typeof t&&t>0},r=t.isInsert=function(t){return"string"==typeof t},i=t.isDelete=function(t){return"number"==typeof t&&t<0};return t.prototype.retain=function(t){if("number"!=typeof t)throw new Error("retain expects an integer");return 0===t?this:(this.baseLength+=t,this.targetLength+=t,o(this.ops[this.ops.length-1])?this.ops[this.ops.length-1]+=t:this.ops.push(t),this)},t.prototype.insert=function(t){if("string"!=typeof t)throw new Error("insert expects a string");if(""===t)return this;this.targetLength+=t.length;var e=this.ops;return r(e[e.length-1])?e[e.length-1]+=t:i(e[e.length-1])?r(e[e.length-2])?e[e.length-2]+=t:(e[e.length]=e[e.length-1],e[e.length-2]=t):e.push(t),this},t.prototype["delete"]=function(t){if("string"==typeof t&&(t=t.length),"number"!=typeof t)throw new Error("delete expects an integer or a string");return 0===t?this:(t>0&&(t=-t),this.baseLength-=t,i(this.ops[this.ops.length-1])?this.ops[this.ops.length-1]+=t:this.ops.push(t),this)},t.prototype.isNoop=function(){return 0===this.ops.length||1===this.ops.length&&o(this.ops[0])},t.prototype.toString=function(){var t=Array.prototype.map||function(t){for(var e=this,n=[],o=0,r=e.length;o<r;o++)n[o]=t(e[o]);return n};return t.call(this.ops,function(t){return o(t)?"retain "+t:r(t)?"insert '"+t+"'":"delete "+-t}).join(", ")},t.prototype.toJSON=function(){return this.ops},t.fromJSON=function(e){for(var n=new t,s=0,a=e.length;s<a;s++){var h=e[s];if(o(h))n.retain(h);else if(r(h))n.insert(h);else{if(!i(h))throw new Error("unknown operation: "+JSON.stringify(h));n["delete"](h)}}return n},t.prototype.apply=function(t){var e=this;if(t.length!==e.baseLength)throw new Error("The operation's base length must be equal to the string's length.");for(var n=[],i=0,s=0,a=this.ops,h=0,p=a.length;h<p;h++){var c=a[h];if(o(c)){if(s+c>t.length)throw new Error("Operation can't retain more characters than are left in the string.");n[i++]=t.slice(s,s+c),s+=c}else r(c)?n[i++]=c:s-=c}if(s!==t.length)throw new Error("The operation didn't operate on the whole string.");return n.join("")},t.prototype.invert=function(e){for(var n=0,i=new t,s=this.ops,a=0,h=s.length;a<h;a++){var p=s[a];o(p)?(i.retain(p),n+=p):r(p)?i["delete"](p.length):(i.insert(e.slice(n,n-p)),n-=p)}return i},t.prototype.compose=function(e){var n=this;if(n.targetLength!==e.baseLength)throw new Error("The base length of the second operation has to be the target length of the first operation");for(var s=new t,a=n.ops,h=e.ops,p=0,c=0,l=a[p++],u=h[c++];;){if("undefined"==typeof l&&"undefined"==typeof u)break;if(i(l))s["delete"](l),l=a[p++];else if(r(u))s.insert(u),u=h[c++];else{if("undefined"==typeof l)throw new Error("Cannot compose operations: first operation is too short.");if("undefined"==typeof u)throw new Error("Cannot compose operations: first operation is too long.");if(o(l)&&o(u))l>u?(s.retain(u),l-=u,u=h[c++]):l===u?(s.retain(l),l=a[p++],u=h[c++]):(s.retain(l),u-=l,l=a[p++]);else if(r(l)&&i(u))l.length>-u?(l=l.slice(-u),u=h[c++]):l.length===-u?(l=a[p++],u=h[c++]):(u+=l.length,l=a[p++]);else if(r(l)&&o(u))l.length>u?(s.insert(l.slice(0,u)),l=l.slice(u),u=h[c++]):l.length===u?(s.insert(l),l=a[p++],u=h[c++]):(s.insert(l),u-=l.length,l=a[p++]);else{if(!o(l)||!i(u))throw new Error("This shouldn't happen: op1: "+JSON.stringify(l)+", op2: "+JSON.stringify(u));l>-u?(s["delete"](u),l+=u,u=h[c++]):l===-u?(s["delete"](u),l=a[p++],u=h[c++]):(s["delete"](l),u+=l,l=a[p++])}}}return s},t.prototype.shouldBeComposedWith=function(t){if(this.isNoop()||t.isNoop())return!0;var o=n(this),s=n(t),a=e(this),h=e(t);return!(!a||!h)&&(r(a)&&r(h)?o+a.length===s:!(!i(a)||!i(h))&&(s-h===o||o===s))},t.prototype.shouldBeComposedWithInverted=function(t){if(this.isNoop()||t.isNoop())return!0;var o=n(this),s=n(t),a=e(this),h=e(t);return!(!a||!h)&&(r(a)&&r(h)?o+a.length===s||o===s:!(!i(a)||!i(h))&&s-h===o)},t.transform=function(e,n){if(e.baseLength!==n.baseLength)throw new Error("Both operations have to have the same base length");for(var s=new t,a=new t,h=e.ops,p=n.ops,c=0,l=0,u=h[c++],f=p[l++];;){if("undefined"==typeof u&&"undefined"==typeof f)break;if(r(u))s.insert(u),a.retain(u.length),u=h[c++];else if(r(f))s.retain(f.length),a.insert(f),f=p[l++];else{if("undefined"==typeof u)throw new Error("Cannot compose operations: first operation is too short.");if("undefined"==typeof f)throw new Error("Cannot compose operations: first operation is too long.");var d;if(o(u)&&o(f))u>f?(d=f,u-=f,f=p[l++]):u===f?(d=f,u=h[c++],f=p[l++]):(d=u,f-=u,u=h[c++]),s.retain(d),a.retain(d);else if(i(u)&&i(f))-u>-f?(u-=f,f=p[l++]):u===f?(u=h[c++],f=p[l++]):(f-=u,u=h[c++]);else if(i(u)&&o(f))-u>f?(d=f,u+=f,f=p[l++]):-u===f?(d=f,u=h[c++],f=p[l++]):(d=-u,f+=u,u=h[c++]),s["delete"](d);else{if(!o(u)||!i(f))throw new Error("The two operations aren't compatible");u>-f?(d=-f,u+=f,f=p[l++]):u===-f?(d=u,u=h[c++],f=p[l++]):(d=u,f+=u,u=h[c++]),a["delete"](d)}}}return[s,a]},t}(),"object"==typeof module&&(module.exports=ot.TextOperation),"undefined"==typeof ot)var ot={};if(ot.Selection=function(t){"use strict";function e(t,e){this.anchor=t,this.head=e}function n(t){this.ranges=t||[]}var o=t.ot?t.ot.TextOperation:require("./text-operation");return e.fromJSON=function(t){return new e(t.anchor,t.head)},e.prototype.equals=function(t){return this.anchor===t.anchor&&this.head===t.head},e.prototype.isEmpty=function(){return this.anchor===this.head},e.prototype.transform=function(t){function n(e){for(var n=e,r=t.ops,i=0,s=t.ops.length;i<s&&(o.isRetain(r[i])?e-=r[i]:o.isInsert(r[i])?n+=r[i].length:(n-=Math.min(e,-r[i]),e+=r[i]),!(e<0));i++);return n}var r=n(this.anchor);return this.anchor===this.head?new e(r,r):new e(r,n(this.head))},n.Range=e,n.createCursor=function(t){return new n([new e(t,t)])},n.fromJSON=function(t){for(var o=t.ranges||t,r=0,i=[];r<o.length;r++)i[r]=e.fromJSON(o[r]);return new n(i)},n.prototype.equals=function(t){if(this.position!==t.position)return!1;if(this.ranges.length!==t.ranges.length)return!1;for(var e=0;e<this.ranges.length;e++)if(!this.ranges[e].equals(t.ranges[e]))return!1;return!0},n.prototype.somethingSelected=function(){for(var t=0;t<this.ranges.length;t++)if(!this.ranges[t].isEmpty())return!0;return!1},n.prototype.compose=function(t){return t},n.prototype.transform=function(t){for(var e=0,o=[];e<this.ranges.length;e++)o[e]=this.ranges[e].transform(t);return new n(o)},n}(this),"object"==typeof module&&(module.exports=ot.Selection),"undefined"==typeof ot)var ot={};if(ot.WrappedOperation=function(t){"use strict";function e(t,e){this.wrapped=t,this.meta=e}function n(t,e){for(var n in t)t.hasOwnProperty(n)&&(e[n]=t[n])}function o(t,e){if(t&&"object"==typeof t){if("function"==typeof t.compose)return t.compose(e);var o={};return n(t,o),n(e,o),o}return e}function r(t,e){return t&&"object"==typeof t&&"function"==typeof t.transform?t.transform(e):t}return e.prototype.apply=function(){return this.wrapped.apply.apply(this.wrapped,arguments)},e.prototype.invert=function(){var t=this.meta;return new e(this.wrapped.invert.apply(this.wrapped,arguments),t&&"object"==typeof t&&"function"==typeof t.invert?t.invert.apply(t,arguments):t)},e.prototype.compose=function(t){return new e(this.wrapped.compose(t.wrapped),o(this.meta,t.meta))},e.transform=function(t,n){var o=t.wrapped.constructor.transform,i=o(t.wrapped,n.wrapped);return[new e(i[0],r(t.meta,n.wrapped)),new e(i[1],r(n.meta,t.wrapped))]},e}(this),"object"==typeof module&&(module.exports=ot.WrappedOperation),"undefined"==typeof ot)var ot={};if(ot.UndoManager=function(){"use strict";function t(t){this.maxItems=t||50,this.state=n,this.dontCompose=!1,this.undoStack=[],this.redoStack=[]}function e(t,e){for(var n=[],o=e.constructor,r=t.length-1;r>=0;r--){var i=o.transform(t[r],e);"function"==typeof i[0].isNoop&&i[0].isNoop()||n.push(i[0]),e=i[1]}return n.reverse()}var n="normal",o="undoing",r="redoing";return t.prototype.add=function(t,e){if(this.state===o)this.redoStack.push(t),this.dontCompose=!0;else if(this.state===r)this.undoStack.push(t),this.dontCompose=!0;else{var n=this.undoStack;!this.dontCompose&&e&&n.length>0?n.push(t.compose(n.pop())):(n.push(t),n.length>this.maxItems&&n.shift()),this.dontCompose=!1,this.redoStack=[]}},t.prototype.transform=function(t){this.undoStack=e(this.undoStack,t),this.redoStack=e(this.redoStack,t)},t.prototype.performUndo=function(t){if(this.state=o,0===this.undoStack.length)throw new Error("undo not possible");t(this.undoStack.pop()),this.state=n},t.prototype.performRedo=function(t){if(this.state=r,0===this.redoStack.length)throw new Error("redo not possible");t(this.redoStack.pop()),this.state=n},t.prototype.canUndo=function(){return 0!==this.undoStack.length},t.prototype.canRedo=function(){return 0!==this.redoStack.length},t.prototype.isUndoing=function(){return this.state===o},t.prototype.isRedoing=function(){return this.state===r},t}(),"object"==typeof module&&(module.exports=ot.UndoManager),"undefined"==typeof ot)var ot={};ot.Client=function(t){"use strict";function e(t){this.revision=t,this.setState(a)}function n(){}function o(t){this.outstanding=t}function r(t,e){this.outstanding=t,this.buffer=e}function i(t,e,n){this.acknowlaged=t,this.client=e,this.revision=n}function s(t,e,n,o){this.acknowlaged=t,this.buffer=e,this.client=n,this.revision=o}e.prototype.setState=function(t){this.state=t},e.prototype.applyClient=function(t){this.setState(this.state.applyClient(this,t))},e.prototype.applyServer=function(t,e){this.setState(this.state.applyServer(this,t,e))},e.prototype.applyOperations=function(t,e){this.setState(this.state.applyOperations(this,t,e))},e.prototype.serverAck=function(t){this.setState(this.state.serverAck(this,t))},e.prototype.serverReconnect=function(){"function"==typeof this.state.resend&&this.state.resend(this)},e.prototype.transformSelection=function(t){return this.state.transformSelection(t)},e.prototype.sendOperation=function(t,e){throw new Error("sendOperation must be defined in child class")},e.prototype.applyOperation=function(t){throw new Error("applyOperation must be defined in child class")},e.Synchronized=n,n.prototype.applyClient=function(t,e){return t.sendOperation(t.revision,e),new o(e)},n.prototype.applyServer=function(t,e,n){if(e-t.revision>1)throw new Error("Invalid revision.");return t.revision=e,t.applyOperation(n),this},n.prototype.serverAck=function(t,e){throw new Error("There is no pending operation.")},n.prototype.transformSelection=function(t){return t};var a=new n;return e.AwaitingConfirm=o,o.prototype.applyClient=function(t,e){return new r(this.outstanding,e)},o.prototype.applyServer=function(t,e,n){if(e-t.revision>1)throw new Error("Invalid revision.");t.revision=e;var r=n.constructor.transform(this.outstanding,n);return t.applyOperation(r[1]),new o(r[0])},o.prototype.serverAck=function(t,e){return e-t.revision>1?new i(this.outstanding,t,e).getOperations():(t.revision=e,a)},o.prototype.transformSelection=function(t){return t.transform(this.outstanding)},o.prototype.resend=function(t){t.sendOperation(t.revision,this.outstanding)},e.AwaitingWithBuffer=r,r.prototype.applyClient=function(t,e){var n=this.buffer.compose(e);return new r(this.outstanding,n)},r.prototype.applyServer=function(t,e,n){if(e-t.revision>1)throw new Error("Invalid revision.");t.revision=e;var o=n.constructor.transform,i=o(this.outstanding,n),s=o(this.buffer,i[1]);return t.applyOperation(s[1]),new r(i[0],s[0])},r.prototype.serverAck=function(t,e){return e-t.revision>1?new s(this.outstanding,this.buffer,t,e).getOperations():(t.revision=e,t.sendOperation(t.revision,this.buffer),new o(this.buffer))},r.prototype.transformSelection=function(t){return t.transform(this.outstanding).transform(this.buffer)},r.prototype.resend=function(t){t.sendOperation(t.revision,this.outstanding)},e.Stale=i,i.prototype.applyClient=function(t,e){return new s(this.acknowlaged,e,t,this.revision)},i.prototype.applyServer=function(t,e,n){throw new Error("Ignored server-side change.")},i.prototype.applyOperations=function(t,e,n){for(var o=this.acknowlaged.constructor.transform,r=0;r<n.length;r++){var i=ot.TextOperation.fromJSON(n[r]),s=o(this.acknowlaged,i);t.applyOperation(s[1]),this.acknowlaged=s[0]}return t.revision=this.revision,a},i.prototype.serverAck=function(t,e){throw new Error("There is no pending operation.")},i.prototype.transformSelection=function(t){return t},i.prototype.getOperations=function(){return this.client.getOperations(this.client.revision,this.revision-1),this},e.StaleWithBuffer=s,s.prototype.applyClient=function(t,e){var n=this.buffer.compose(e);return new s(this.acknowlaged,n,t,this.revision)},s.prototype.applyServer=function(t,e,n){throw new Error("Ignored server-side change.")},s.prototype.applyOperations=function(t,e,n){for(var r=this.acknowlaged.constructor.transform,i=0;i<n.length;i++){var s=ot.TextOperation.fromJSON(n[i]),a=r(this.acknowlaged,s),h=r(this.buffer,a[1]);t.applyOperation(h[1]),this.acknowlaged=a[0],this.buffer=h[0]}return t.revision=this.revision,t.sendOperation(t.revision,this.buffer),new o(this.buffer)},s.prototype.serverAck=function(t,e){throw new Error("There is no pending operation.")},s.prototype.transformSelection=function(t){return t},s.prototype.getOperations=function(){return this.client.getOperations(this.client.revision,this.revision-1),this},e}(this),"object"==typeof module&&(module.exports=ot.Client),ot.CodeMirrorAdapter=function(t){"use strict";function e(t){this.cm=t,this.ignoreNextChange=!1,this.changeInProgress=!1,this.selectionChanged=!1,a(this,"onChanges"),a(this,"onChange"),a(this,"onCursorActivity"),a(this,"onFocus"),a(this,"onBlur"),t.on("changes",this.onChanges),t.on("change",this.onChange),t.on("cursorActivity",this.onCursorActivity),t.on("focus",this.onFocus),t.on("blur",this.onBlur)}function n(t,e){return t.line<e.line?-1:t.line>e.line?1:t.ch<e.ch?-1:t.ch>e.ch?1:0}function o(t,e){return n(t,e)<=0}function r(t,e){return o(t,e)?t:e}function i(t,e){return o(t,e)?e:t}function s(t){return t.indexFromPos({line:t.lastLine(),ch:0})+t.getLine(t.lastLine()).length}function a(t,e){var n=t[e];t[e]=function(){n.apply(t,arguments)}}var h=ot.TextOperation,p=ot.Selection;e.prototype.detach=function(){this.cm.off("changes",this.onChanges),this.cm.off("change",this.onChange),this.cm.off("cursorActivity",this.onCursorActivity),this.cm.off("focus",this.onFocus),this.cm.off("blur",this.onBlur)},e.operationFromCodeMirrorChanges=function(t,e){function n(t){return t[t.length-1]}function r(t){if(0===t.length)return 0;for(var e=0,n=0;n<t.length;n++)e+=t[n].length;return e+t.length-1}function i(t,e){return function(i){return o(i,e.from)?t(i):o(e.to,i)?t({line:i.line+e.text.length-1-(e.to.line-e.from.line),ch:e.to.line<i.line?i.ch:e.text.length<=1?i.ch-(e.to.ch-e.from.ch)+r(e.text):i.ch-e.to.ch+n(e.text).length})+r(e.removed)-r(e.text):e.from.line===i.line?t(e.from)+i.ch-e.from.ch:t(e.from)+r(e.removed.slice(0,i.line-e.from.line))+1+i.ch}}for(var a=s(e),p=(new h).retain(a),c=(new h).retain(a),l=function(t){return e.indexFromPos(t)},u=t.length-1;u>=0;u--){var f=t[u];l=i(l,f);var d=l(f.from),g=a-d-r(f.text);p=(new h).retain(d)["delete"](r(f.removed)).insert(f.text.join("\n")).retain(g).compose(p),c=c.compose((new h).retain(d)["delete"](r(f.text)).insert(f.removed.join("\n")).retain(g)),a+=r(f.removed)-r(f.text)}return[p,c]},e.operationFromCodeMirrorChange=e.operationFromCodeMirrorChanges,e.applyOperationToCodeMirror=function(t,e){e.operation(function(){for(var n=t.ops,o=0,r=0,i=n.length;r<i;r++){var s=n[r];if(h.isRetain(s))o+=s;else if(h.isInsert(s))e.replaceRange(s,e.posFromIndex(o),null,"ignoreHistory"),o+=s.length;else if(h.isDelete(s)){var a=e.posFromIndex(o),p=e.posFromIndex(o-s);e.replaceRange("",a,p,"ignoreHistory")}}})},e.prototype.registerCallbacks=function(t){this.callbacks=t},e.prototype.onChange=function(){this.changeInProgress=!0},e.prototype.onChanges=function(t,n){if(!this.ignoreNextChange){var o=e.operationFromCodeMirrorChanges(n,this.cm);this.trigger("change",o[0],o[1])}this.selectionChanged&&this.trigger("selectionChange"),this.changeInProgress=!1,this.ignoreNextChange=!1},e.prototype.onCursorActivity=e.prototype.onFocus=function(){this.changeInProgress?this.selectionChanged=!0:this.trigger("selectionChange")},e.prototype.onBlur=function(){this.cm.somethingSelected()||this.trigger("blur")},e.prototype.getValue=function(){return this.cm.getValue()},e.prototype.getSelection=function(){for(var t=this.cm,e=t.listSelections(),n=[],o=0;o<e.length;o++)n[o]=new p.Range(t.indexFromPos(e[o].anchor),t.indexFromPos(e[o].head));return new p(n)},e.prototype.setSelection=function(t){for(var e=[],n=0;t&&n<t.ranges.length;n++){var o=t.ranges[n];e[n]={anchor:this.cm.posFromIndex(o.anchor),head:this.cm.posFromIndex(o.head)}}this.cm.setSelections(e)};var c=function(){var t={},e=document.createElement("style");document.documentElement.getElementsByTagName("head")[0].appendChild(e);var n=e.sheet;return function(e){t[e]||(t[e]=!0,n.insertRule(e,(n.cssRules||n.rules).length))}}();return e.prototype.setOtherCursor=function(t,e,n){var o=this.cm.posFromIndex(t),r=(this.cm.cursorCoords(o),document.createElement("span"));return r.className="other-client",r.style.display="none",r.setAttribute("data-clientid",n),this.cm.setBookmark(o,{widget:r,insertLeft:!0})},e.prototype.setOtherSelectionRange=function(t,e,n){var o=/^#([0-9a-fA-F]{6})$/.exec(e);if(!o)throw new Error("only six-digit hex colors are allowed.");var s="selection-"+o[1],a=hex2rgb(e),h="."+s+" { background: rgba("+a.red+","+a.green+","+a.blue+",0.2); }";c(h);var p=this.cm.posFromIndex(t.anchor),l=this.cm.posFromIndex(t.head);return this.cm.markText(r(p,l),i(p,l),{className:s})},e.prototype.setOtherSelection=function(t,e,n){for(var o=[],r=0;r<t.ranges.length;r++){var i=t.ranges[r];i.isEmpty()||(o[r]=this.setOtherSelectionRange(i,e,n))}return{clear:function(){for(var t=0;t<o.length;t++)o[t]&&o[t].clear()}}},e.prototype.trigger=function(t){var e=Array.prototype.slice.call(arguments,1),n=this.callbacks&&this.callbacks[t];n&&n.apply(this,e)},e.prototype.applyOperation=function(t){t.isNoop()||(this.ignoreNextChange=!0),e.applyOperationToCodeMirror(t,this.cm)},e.prototype.registerUndo=function(t){this.cm.undo=t},e.prototype.registerRedo=function(t){this.cm.redo=t},e}(this),ot.SocketIOAdapter=function(){"use strict";function t(t){this.socket=t;var e=this;t.on("client_left",function(t){e.trigger("client_left",t)}),t.on("set_name",function(t,n){e.trigger("set_name",t,n)}),t.on("set_color",function(t,n){e.trigger("set_color",t,n)}),t.on("ack",function(t){e.trigger("ack",t)}),t.on("operation",function(t,n,o,r){e.trigger("operation",n,o),e.trigger("selection",t,r)}),t.on("operations",function(t,n){e.trigger("operations",t,n)}),t.on("selection",function(t,n){e.trigger("selection",t,n)}),t.on("reconnect",function(){e.trigger("reconnect")})}return t.prototype.sendOperation=function(t,e,n){this.socket.emit("operation",t,e,n)},t.prototype.sendSelection=function(t){this.socket.emit("selection",t)},t.prototype.getOperations=function(t,e){this.socket.emit("get_operations",t,e)},t.prototype.registerCallbacks=function(t){this.callbacks=t},t.prototype.trigger=function(t){var e=Array.prototype.slice.call(arguments,1),n=this.callbacks&&this.callbacks[t];n&&n.apply(this,e)},t}(),ot.AjaxAdapter=function(){"use strict";function t(t,e,n){"/"!==t[t.length-1]&&(t+="/"),this.path=t,this.ownUserName=e,this.majorRevision=n.major||0,this.minorRevision=n.minor||0,this.poll()}return t.prototype.renderRevisionPath=function(){return"revision/"+this.majorRevision+"-"+this.minorRevision},t.prototype.handleResponse=function(t){var e,n=t.operations;for(e=0;e<n.length;e++)n[e].user===this.ownUserName?this.trigger("ack"):this.trigger("operation",n[e].operation);n.length>0&&(this.majorRevision+=n.length,this.minorRevision=0);var o=t.events;if(o){for(e=0;e<o.length;e++){var r=o[e].user;if(r!==this.ownUserName)switch(o[e].event){case"joined":this.trigger("set_name",r,r);break;case"left":this.trigger("client_left",r);break;case"selection":this.trigger("selection",r,o[e].selection)}}this.minorRevision+=o.length}var i=t.users;i&&(delete i[this.ownUserName],this.trigger("clients",i)),t.revision&&(this.majorRevision=t.revision.major,this.minorRevision=t.revision.minor)},t.prototype.poll=function(){var t=this;$.ajax({url:this.path+this.renderRevisionPath(),type:"GET",dataType:"json",timeout:5e3,success:function(e){t.handleResponse(e),t.poll()},error:function(){setTimeout(function(){t.poll()},500)}})},t.prototype.sendOperation=function(t,e,n){if(t!==this.majorRevision)throw new Error("Revision numbers out of sync");var o=this;$.ajax({url:this.path+this.renderRevisionPath(),type:"POST",data:JSON.stringify({operation:e,selection:n}),contentType:"application/json",processData:!1,success:function(t){},error:function(){setTimeout(function(){o.sendOperation(t,e,n)},500)}})},t.prototype.sendSelection=function(t){$.ajax({url:this.path+this.renderRevisionPath()+"/selection",type:"POST",data:JSON.stringify(t),contentType:"application/json",processData:!1,timeout:1e3})},t.prototype.registerCallbacks=function(t){this.callbacks=t},t.prototype.trigger=function(t){var e=Array.prototype.slice.call(arguments,1),n=this.callbacks&&this.callbacks[t];n&&n.apply(this,e)},t}(),ot.EditorClient=function(){"use strict";function t(t,e){this.selectionBefore=t,this.selectionAfter=e}function e(t,e){this.clientId=t,this.selection=e}function n(t,e,n,o,r,i){this.id=t,this.listEl=e,this.editorAdapter=n,this.name=o,this.color=r,this.li=document.createElement("li"),o&&(this.li.textContent=o,this.listEl.appendChild(this.li)),r?this.setForceColor(r):this.setColor(o?s(o):Math.random()),i&&this.updateSelection(i)}function o(t,e,n,o){c.call(this,t),this.serverAdapter=n,this.editorAdapter=o,this.undoManager=new u,this.initializeClientList(),this.initializeClients(e);var r=this;this.editorAdapter.registerCallbacks({change:function(t,e){r.onChange(t,e)},selectionChange:function(){r.onSelectionChange()},blur:function(){r.onBlur()}}),this.editorAdapter.registerUndo(function(){r.undo()}),this.editorAdapter.registerRedo(function(){r.redo()}),this.serverAdapter.registerCallbacks({client_left:function(t){r.onClientLeft(t)},set_name:function(t,e){r.getClientObject(t).setName(e)},set_color:function(t,e){r.getClientObject(t).setForceColor(e)},ack:function(t){r.serverAck(t)},operation:function(t,e){r.applyServer(t,f.fromJSON(e))},operations:function(t,e){r.applyOperations(t,e)},selection:function(t,e){e?r.getClientObject(t).updateSelection(r.transformSelection(l.fromJSON(e))):r.getClientObject(t).removeSelection()},clients:function(t){var e;for(e in r.clients)r.clients.hasOwnProperty(e)&&!t.hasOwnProperty(e)&&r.onClientLeft(e);for(e in t)if(t.hasOwnProperty(e)){var n=r.getClientObject(e);t[e].name&&n.setName(t[e].name);var o=t[e].selection;o?r.clients[e].updateSelection(r.transformSelection(l.fromJSON(o))):r.clients[e].removeSelection()}},reconnect:function(){r.serverReconnect()}})}function r(t,e,n){function o(t){var e=Math.round(255*t).toString(16);return 1===e.length?"0"+e:e}return"#"+o(t)+o(e)+o(n)}function i(t,e,n){if(0===e)return r(n,n,n);var o=n<.5?n*(1+e):n+e-e*n,i=2*n-o,s=function(t){return t<0&&(t+=1),t>1&&(t-=1),6*t<1?i+6*(o-i)*t:2*t<1?o:3*t<2?i+6*(o-i)*(2/3-t):i};return r(s(t+1/3),s(t),s(t-1/3))}function s(t){for(var e=1,n=0;n<t.length;n++)e=17*(e+t.charCodeAt(n))%360;return e/360}function a(t,e){function n(){}n.prototype=e.prototype,t.prototype=new n,t.prototype.constructor=t}function h(t){return t[t.length-1]}function p(t){t.parentNode&&t.parentNode.removeChild(t)}var c=ot.Client,l=ot.Selection,u=ot.UndoManager,f=ot.TextOperation,d=ot.WrappedOperation;return t.prototype.invert=function(){return new t(this.selectionAfter,this.selectionBefore)},t.prototype.compose=function(e){return new t(this.selectionBefore,e.selectionAfter)},t.prototype.transform=function(e){return new t(this.selectionBefore?this.selectionBefore.transform(e):null,this.selectionAfter?this.selectionAfter.transform(e):null)},e.fromJSON=function(t){return new e(t.clientId,t.selection&&l.fromJSON(t.selection))},e.prototype.transform=function(t){return new e(this.clientId,this.selection&&this.selection.transform(t))},n.prototype.setColor=function(t){this.hue=t,this.color=i(t,.75,.5),this.lightColor=i(t,.5,.9),this.li&&(this.li.style.color=this.color)},n.prototype.setForceColor=function(t){this.hue=null,this.color=t,this.lightColor=t,this.li&&(this.li.style.color=this.color)},n.prototype.setName=function(t){this.name!==t&&(this.name=t,this.li.textContent=t,this.li.parentNode||this.listEl.appendChild(this.li),this.setColor(s(t)))},n.prototype.updateSelection=function(t){this.removeSelection(),this.selection=t,this.mark=this.editorAdapter.setOtherSelection(t,t.position===t.selectionEnd?this.color:this.lightColor,this.id)},n.prototype.remove=function(){this.li&&p(this.li),this.removeSelection()},n.prototype.removeSelection=function(){this.mark&&(this.mark.clear(),this.mark=null)},a(o,c),o.prototype.addClient=function(t,e){this.clients[t]=new n(t,this.clientListEl,this.editorAdapter,e.name||t,e.color||null,e.selection?l.fromJSON(e.selection):null)},o.prototype.initializeClients=function(t){this.clients={};for(var e in t)t.hasOwnProperty(e)&&this.addClient(e,t[e])},o.prototype.getClientObject=function(t){var e=this.clients[t];return e?e:this.clients[t]=new n(t,this.clientListEl,this.editorAdapter)},o.prototype.onClientLeft=function(t){var e=this.clients[t];e&&(e.remove(),delete this.clients[t])},o.prototype.initializeClientList=function(){this.clientListEl=document.createElement("ul")},o.prototype.applyUnredo=function(t){this.undoManager.add(t.invert(this.editorAdapter.getValue())),this.editorAdapter.applyOperation(t.wrapped),this.selection=t.meta.selectionAfter,this.editorAdapter.setSelection(this.selection),this.applyClient(t.wrapped)},o.prototype.undo=function(){var t=this;this.undoManager.canUndo()&&this.undoManager.performUndo(function(e){t.applyUnredo(e)})},o.prototype.redo=function(){var t=this;this.undoManager.canRedo()&&this.undoManager.performRedo(function(e){t.applyUnredo(e)})},o.prototype.onChange=function(e,n){var o=this.selection;this.updateSelection();var r=new t(o,this.selection),i=(new d(e,r),this.undoManager.undoStack.length>0&&n.shouldBeComposedWithInverted(h(this.undoManager.undoStack).wrapped)),s=new t(this.selection,o);this.undoManager.add(new d(n,s),i),this.applyClient(e)},o.prototype.updateSelection=function(){this.selection=this.editorAdapter.getSelection()},o.prototype.onSelectionChange=function(){var t=this.selection;this.updateSelection(),t&&this.selection.equals(t)||this.sendSelection(this.selection)},o.prototype.onBlur=function(){this.selection=null,this.sendSelection(null)},o.prototype.sendSelection=function(t){this.state instanceof c.AwaitingWithBuffer||this.serverAdapter.sendSelection(t)},o.prototype.sendOperation=function(t,e){this.serverAdapter.sendOperation(t,e.toJSON(),this.selection)},o.prototype.getOperations=function(t,e){this.serverAdapter.getOperations(t,e)},o.prototype.applyOperation=function(t){this.editorAdapter.applyOperation(t),this.updateSelection(),this.undoManager.transform(new d(t,null))},o}();
\ No newline at end of file
+var ot;function hex2rgb(t){if(3==(t="#"==t[0]?t.substr(1):t).length){var e=t;t="";for(var e=/^([a-f0-9])([a-f0-9])([a-f0-9])$/i.exec(e).slice(1),n=0;n<3;n++)t+=e[n]+e[n]}var o=/^([a-f0-9]{2})([a-f0-9]{2})([a-f0-9]{2})$/i.exec(t).slice(1);return{red:parseInt(o[0],16),green:parseInt(o[1],16),blue:parseInt(o[2],16)}}(ot=void 0===ot?{}:ot).TextOperation=(()=>{function l(){if(!this||this.constructor!==l)return new l;this.ops=[],this.baseLength=0,this.targetLength=0}l.prototype.equals=function(t){if(this.baseLength!==t.baseLength)return!1;if(this.targetLength!==t.targetLength)return!1;if(this.ops.length!==t.ops.length)return!1;for(var e=0;e<this.ops.length;e++)if(this.ops[e]!==t.ops[e])return!1;return!0};var u=l.isRetain=function(t){return"number"==typeof t&&0<t},f=l.isInsert=function(t){return"string"==typeof t},g=l.isDelete=function(t){return"number"==typeof t&&t<0};function i(t){var e=t.ops,n=l.isRetain;switch(e.length){case 1:return e[0];case 2:return n(e[0])?e[1]:n(e[1])?e[0]:null;case 3:if(n(e[0])&&n(e[2]))return e[1]}return null}function r(t){return u(t.ops[0])?t.ops[0]:0}return l.prototype.retain=function(t){if("number"!=typeof t)throw new Error("retain expects an integer");return 0!==t&&(this.baseLength+=t,this.targetLength+=t,u(this.ops[this.ops.length-1])?this.ops[this.ops.length-1]+=t:this.ops.push(t)),this},l.prototype.insert=function(t){if("string"!=typeof t)throw new Error("insert expects a string");var e;return""!==t&&(this.targetLength+=t.length,e=this.ops,f(e[e.length-1])?e[e.length-1]+=t:g(e[e.length-1])?f(e[e.length-2])?e[e.length-2]+=t:(e[e.length]=e[e.length-1],e[e.length-2]=t):e.push(t)),this},l.prototype.delete=function(t){if("number"!=typeof(t="string"==typeof t?t.length:t))throw new Error("delete expects an integer or a string");return 0!==t&&(this.baseLength-=t=0<t?-t:t,g(this.ops[this.ops.length-1])?this.ops[this.ops.length-1]+=t:this.ops.push(t)),this},l.prototype.isNoop=function(){return 0===this.ops.length||1===this.ops.length&&u(this.ops[0])},l.prototype.toString=function(){return(Array.prototype.map||function(t){for(var e=[],n=0,o=this.length;n<o;n++)e[n]=t(this[n]);return e}).call(this.ops,function(t){return u(t)?"retain "+t:f(t)?"insert '"+t+"'":"delete "+-t}).join(", ")},l.prototype.toJSON=function(){return this.ops},l.fromJSON=function(t){for(var e=new l,n=0,o=t.length;n<o;n++){var i=t[n];if(u(i))e.retain(i);else if(f(i))e.insert(i);else{if(!g(i))throw new Error("unknown operation: "+JSON.stringify(i));e.delete(i)}}return e},l.prototype.apply=function(t){if(t.length!==this.baseLength)throw new Error("The operation's base length must be equal to the string's length.");for(var e=[],n=0,o=0,i=this.ops,r=0,s=i.length;r<s;r++){var a=i[r];if(u(a)){if(o+a>t.length)throw new Error("Operation can't retain more characters than are left in the string.");e[n++]=t.slice(o,o+a),o+=a}else f(a)?e[n++]=a:o-=a}if(o!==t.length)throw new Error("The operation didn't operate on the whole string.");return e.join("")},l.prototype.invert=function(t){for(var e=0,n=new l,o=this.ops,i=0,r=o.length;i<r;i++){var s=o[i];u(s)?(n.retain(s),e+=s):f(s)?n.delete(s.length):(n.insert(t.slice(e,e-s)),e-=s)}return n},l.prototype.compose=function(t){if(this.targetLength!==t.baseLength)throw new Error("The base length of the second operation has to be the target length of the first operation");for(var e=new l,n=this.ops,o=t.ops,i=0,r=0,s=n[i++],a=o[r++];void 0!==s||void 0!==a;)if(g(s))e.delete(s),s=n[i++];else if(f(a))e.insert(a),a=o[r++];else{if(void 0===s)throw new Error("Cannot compose operations: first operation is too short.");if(void 0===a)throw new Error("Cannot compose operations: first operation is too long.");if(u(s)&&u(a))a<s?(e.retain(a),s-=a,a=o[r++]):s===a?(e.retain(s),s=n[i++],a=o[r++]):(e.retain(s),a-=s,s=n[i++]);else if(f(s)&&g(a))s.length>-a?(s=s.slice(-a),a=o[r++]):s.length===-a?(s=n[i++],a=o[r++]):(a+=s.length,s=n[i++]);else if(f(s)&&u(a))s.length>a?(e.insert(s.slice(0,a)),s=s.slice(a),a=o[r++]):s.length===a?(e.insert(s),s=n[i++],a=o[r++]):(e.insert(s),a-=s.length,s=n[i++]);else{if(!u(s)||!g(a))throw new Error("This shouldn't happen: op1: "+JSON.stringify(s)+", op2: "+JSON.stringify(a));-a<s?(e.delete(a),s+=a,a=o[r++]):s===-a?(e.delete(a),s=n[i++],a=o[r++]):(e.delete(s),a+=s,s=n[i++])}}return e},l.prototype.shouldBeComposedWith=function(t){var e,n,o;return!!(this.isNoop()||t.isNoop()||(e=r(this),n=r(t),o=i(this),t=i(t),o&&t&&(f(o)&&f(t)?e+o.length===n:g(o)&&g(t)&&(n-t===e||e===n))))},l.prototype.shouldBeComposedWithInverted=function(t){var e,n,o;return!!(this.isNoop()||t.isNoop()||(e=r(this),n=r(t),o=i(this),t=i(t),o&&t&&(f(o)&&f(t)?e+o.length===n||e===n:g(o)&&g(t)&&n-t===e)))},l.transform=function(t,e){if(t.baseLength!==e.baseLength)throw new Error("Both operations have to have the same base length");for(var n,o=new l,i=new l,r=t.ops,s=e.ops,a=0,p=0,h=r[a++],c=s[p++];void 0!==h||void 0!==c;)if(f(h))o.insert(h),i.retain(h.length),h=r[a++];else if(f(c))o.retain(c.length),i.insert(c),c=s[p++];else{if(void 0===h)throw new Error("Cannot compose operations: first operation is too short.");if(void 0===c)throw new Error("Cannot compose operations: first operation is too long.");if(u(h)&&u(c))c<h?(h-=n=c,c=s[p++]):h===c?(n=c,h=r[a++],c=s[p++]):(c-=n=h,h=r[a++]),o.retain(n),i.retain(n);else if(g(h)&&g(c))-c<-h?(h-=c,c=s[p++]):h===c?(h=r[a++],c=s[p++]):(c-=h,h=r[a++]);else if(g(h)&&u(c))c<-h?(h+=n=c,c=s[p++]):-h===c?(n=c,h=r[a++],c=s[p++]):(n=-h,c+=h,h=r[a++]),o.delete(n);else{if(!u(h)||!g(c))throw new Error("The two operations aren't compatible");-c<h?(n=-c,h+=c,c=s[p++]):h===-c?(n=h,h=r[a++],c=s[p++]):(c+=n=h,h=r[a++]),i.delete(n)}}return[o,i]},l})(),"object"==typeof module&&(module.exports=ot.TextOperation),(ot=void 0===ot?{}:ot).Selection=(t=>{var s=t.ot?t.ot.TextOperation:require("./text-operation");function i(t,e){this.anchor=t,this.head=e}function r(t){this.ranges=t||[]}return i.fromJSON=function(t){return new i(t.anchor,t.head)},i.prototype.equals=function(t){return this.anchor===t.anchor&&this.head===t.head},i.prototype.isEmpty=function(){return this.anchor===this.head},i.prototype.transform=function(r){function t(t){for(var e=t,n=r.ops,o=0,i=r.ops.length;o<i&&(s.isRetain(n[o])?t-=n[o]:s.isInsert(n[o])?e+=n[o].length:(e-=Math.min(t,-n[o]),t+=n[o]),!(t<0));o++);return e}var e=t(this.anchor);return this.anchor===this.head?new i(e,e):new i(e,t(this.head))},r.Range=i,r.createCursor=function(t){return new r([new i(t,t)])},r.fromJSON=function(t){for(var e=t.ranges||t,n=0,o=[];n<e.length;n++)o[n]=i.fromJSON(e[n]);return new r(o)},r.prototype.equals=function(t){if(this.position!==t.position)return!1;if(this.ranges.length!==t.ranges.length)return!1;for(var e=0;e<this.ranges.length;e++)if(!this.ranges[e].equals(t.ranges[e]))return!1;return!0},r.prototype.somethingSelected=function(){for(var t=0;t<this.ranges.length;t++)if(!this.ranges[t].isEmpty())return!0;return!1},r.prototype.compose=function(t){return t},r.prototype.transform=function(t){for(var e=0,n=[];e<this.ranges.length;e++)n[e]=this.ranges[e].transform(t);return new r(n)},r})(this),"object"==typeof module&&(module.exports=ot.Selection),(ot=void 0===ot?{}:ot).WrappedOperation=(()=>{function o(t,e){this.wrapped=t,this.meta=e}function n(t,e){for(var n in t)t.hasOwnProperty(n)&&(e[n]=t[n])}function i(t,e){return t&&"object"==typeof t&&"function"==typeof t.transform?t.transform(e):t}return o.prototype.apply=function(){return this.wrapped.apply.apply(this.wrapped,arguments)},o.prototype.invert=function(){var t=this.meta;return new o(this.wrapped.invert.apply(this.wrapped,arguments),t&&"object"==typeof t&&"function"==typeof t.invert?t.invert.apply(t,arguments):t)},o.prototype.compose=function(t){return new o(this.wrapped.compose(t.wrapped),(e=this.meta,t=t.meta,e&&"object"==typeof e?"function"==typeof e.compose?e.compose(t):(n(e,e={}),n(t,e),e):t));var e},o.transform=function(t,e){var n=(0,t.wrapped.constructor.transform)(t.wrapped,e.wrapped);return[new o(n[0],i(t.meta,e.wrapped)),new o(n[1],i(e.meta,t.wrapped))]},o})(),"object"==typeof module&&(module.exports=ot.WrappedOperation),(ot=void 0===ot?{}:ot).UndoManager=(()=>{var e="normal",o="undoing",i="redoing";function t(t){this.maxItems=t||50,this.state=e,this.dontCompose=!1,this.undoStack=[],this.redoStack=[]}function n(t,e){for(var n=[],o=e.constructor,i=t.length-1;0<=i;i--){var r=o.transform(t[i],e);"function"==typeof r[0].isNoop&&r[0].isNoop()||n.push(r[0]),e=r[1]}return n.reverse()}return t.prototype.add=function(t,e){var n;this.state===o?(this.redoStack.push(t),this.dontCompose=!0):this.state===i?(this.undoStack.push(t),this.dontCompose=!0):(n=this.undoStack,!this.dontCompose&&e&&0<n.length?n.push(t.compose(n.pop())):(n.push(t),n.length>this.maxItems&&n.shift()),this.dontCompose=!1,this.redoStack=[])},t.prototype.transform=function(t){this.undoStack=n(this.undoStack,t),this.redoStack=n(this.redoStack,t)},t.prototype.performUndo=function(t){if(this.state=o,0===this.undoStack.length)throw new Error("undo not possible");t(this.undoStack.pop()),this.state=e},t.prototype.performRedo=function(t){if(this.state=i,0===this.redoStack.length)throw new Error("redo not possible");t(this.redoStack.pop()),this.state=e},t.prototype.canUndo=function(){return 0!==this.undoStack.length},t.prototype.canRedo=function(){return 0!==this.redoStack.length},t.prototype.isUndoing=function(){return this.state===o},t.prototype.isRedoing=function(){return this.state===i},t})(),"object"==typeof module&&(module.exports=ot.UndoManager),(ot=void 0===ot?{}:ot).Client=(()=>{function t(t){this.revision=t,this.setState(p)}function e(){}t.prototype.setState=function(t){this.state=t},t.prototype.applyClient=function(t){this.setState(this.state.applyClient(this,t))},t.prototype.applyServer=function(t,e){this.setState(this.state.applyServer(this,t,e))},t.prototype.applyOperations=function(t,e){this.setState(this.state.applyOperations(this,t,e))},t.prototype.serverAck=function(t){this.setState(this.state.serverAck(this,t))},t.prototype.serverReconnect=function(){"function"==typeof this.state.resend&&this.state.resend(this)},t.prototype.transformSelection=function(t){return this.state.transformSelection(t)},t.prototype.sendOperation=function(t,e){throw new Error("sendOperation must be defined in child class")},t.prototype.applyOperation=function(t){throw new Error("applyOperation must be defined in child class")},(t.Synchronized=e).prototype.applyClient=function(t,e){return t.sendOperation(t.revision,e),new c(e)},e.prototype.applyServer=function(t,e,n){if(1<e-t.revision)throw new Error("Invalid revision.");return t.revision=e,t.applyOperation(n),this},e.prototype.serverAck=function(t,e){throw new Error("There is no pending operation.")},e.prototype.transformSelection=function(t){return t};var p=new e;function c(t){this.outstanding=t}function o(t,e){this.outstanding=t,this.buffer=e}function n(t,e,n){this.acknowlaged=t,this.client=e,this.revision=n,this.pendingOps=[]}function i(t,e,n,o){this.acknowlaged=t,this.buffer=e,this.client=n,this.revision=o,this.pendingOps=[]}return(t.AwaitingConfirm=c).prototype.applyClient=function(t,e){return new o(this.outstanding,e)},c.prototype.applyServer=function(t,e,n){if(1<e-t.revision)throw new Error("Invalid revision.");t.revision=e;e=n.constructor.transform(this.outstanding,n);return t.applyOperation(e[1]),new c(e[0])},c.prototype.serverAck=function(t,e){return 1<e-t.revision?new n(this.outstanding,t,e).getOperations():(t.revision=e,p)},c.prototype.transformSelection=function(t){return t.transform(this.outstanding)},c.prototype.resend=function(t){t.sendOperation(t.revision,this.outstanding)},(t.AwaitingWithBuffer=o).prototype.applyClient=function(t,e){e=this.buffer.compose(e);return new o(this.outstanding,e)},o.prototype.applyServer=function(t,e,n){if(1<e-t.revision)throw new Error("Invalid revision.");t.revision=e;e=n.constructor.transform,n=e(this.outstanding,n),e=e(this.buffer,n[1]);return t.applyOperation(e[1]),new o(n[0],e[0])},o.prototype.serverAck=function(t,e){return 1<e-t.revision?new i(this.outstanding,this.buffer,t,e).getOperations():(t.revision=e,t.sendOperation(t.revision,this.buffer),new c(this.buffer))},o.prototype.transformSelection=function(t){return t.transform(this.outstanding).transform(this.buffer)},o.prototype.resend=function(t){t.sendOperation(t.revision,this.outstanding)},(t.Stale=n).prototype.applyClient=function(t,e){e=new i(this.acknowlaged,e,t,this.revision);return e.pendingOps=this.pendingOps,e},n.prototype.applyServer=function(t,e,n){return this.pendingOps.push({revision:e,operation:n}),this},n.prototype.applyOperations=function(t,e,n){for(var o=this.acknowlaged.constructor.transform,i=0;i<n.length;i++){var r=ot.TextOperation.fromJSON(n[i]),r=o(this.acknowlaged,r);t.applyOperation(r[1]),this.acknowlaged=r[0]}t.revision=this.revision;for(var s=0;s<this.pendingOps.length;s++){var a=this.pendingOps[s];t.revision=a.revision,t.applyOperation(a.operation)}return p},n.prototype.serverAck=function(t,e){throw new Error("There is no pending operation.")},n.prototype.transformSelection=function(t){return t},n.prototype.getOperations=function(){return this.client.getOperations(this.client.revision,this.revision-1),this},(t.StaleWithBuffer=i).prototype.applyClient=function(t,e){e=this.buffer.compose(e),e=new i(this.acknowlaged,e,t,this.revision);return e.pendingOps=this.pendingOps,e},i.prototype.applyServer=function(t,e,n){return this.pendingOps.push({revision:e,operation:n}),this},i.prototype.applyOperations=function(t,e,n){for(var o=this.acknowlaged.constructor.transform,i=0;i<n.length;i++){var r=ot.TextOperation.fromJSON(n[i]),r=o(this.acknowlaged,r),s=o(this.buffer,r[1]);t.applyOperation(s[1]),this.acknowlaged=r[0],this.buffer=s[0]}t.revision=this.revision;for(var a=0;a<this.pendingOps.length;a++){var p=this.pendingOps[a],h=o(this.buffer,p.operation);t.applyOperation(h[1]),this.buffer=h[0],t.revision=p.revision}return t.sendOperation(t.revision,this.buffer),new c(this.buffer)},i.prototype.serverAck=function(t,e){throw new Error("There is no pending operation.")},i.prototype.transformSelection=function(t){return t},i.prototype.getOperations=function(){return this.client.getOperations(this.client.revision,this.revision-1),this},t})(),"object"==typeof module&&(module.exports=ot.Client),ot.CodeMirrorAdapter=(()=>{var f=ot.TextOperation,i=ot.Selection;function n(t){this.cm=t,this.ignoreNextChange=!1,this.changeInProgress=!1,this.selectionChanged=!1,a(this,"onChanges"),a(this,"onChange"),a(this,"onCursorActivity"),a(this,"onFocus"),a(this,"onBlur"),t.on("changes",this.onChanges),t.on("change",this.onChange),t.on("cursorActivity",this.onCursorActivity),t.on("focus",this.onFocus),t.on("blur",this.onBlur)}function o(t,e){return t.line<e.line?-1:e.line<t.line?1:t.ch<e.ch?-1:e.ch<t.ch?1:0}function g(t,e){return o(t,e)<=0}n.prototype.detach=function(){this.cm.off("changes",this.onChanges),this.cm.off("change",this.onChange),this.cm.off("cursorActivity",this.onCursorActivity),this.cm.off("focus",this.onFocus),this.cm.off("blur",this.onBlur)},n.operationFromCodeMirrorChange=n.operationFromCodeMirrorChanges=function(t,e){var n,o=(n=e).indexFromPos({line:n.lastLine(),ch:0})+n.getLine(n.lastLine()).length,i=(new f).retain(o),r=(new f).retain(o),s=function(t){return e.indexFromPos(t)};function a(t){if(0===t.length)return 0;for(var e=0,n=0;n<t.length;n++)e+=t[n].length;return e+t.length-1}function p(n,o){return function(t){var e;return g(t,o.from)?n(t):g(o.to,t)?n({line:t.line+o.text.length-1-(o.to.line-o.from.line),ch:o.to.line<t.line?t.ch:o.text.length<=1?t.ch-(o.to.ch-o.from.ch)+a(o.text):t.ch-o.to.ch+(e=o.text)[e.length-1].length})+a(o.removed)-a(o.text):o.from.line===t.line?n(o.from)+t.ch-o.from.ch:n(o.from)+a(o.removed.slice(0,t.line-o.from.line))+1+t.ch}}for(var h=t.length-1;0<=h;h--){var c=t[h],l=(s=p(s,c))(c.from),u=o-l-a(c.text),i=(new f).retain(l).delete(a(c.removed)).insert(c.text.join("\n")).retain(u).compose(i),r=r.compose((new f).retain(l).delete(a(c.text)).insert(c.removed.join("\n")).retain(u));o+=a(c.removed)-a(c.text)}return[i,r]},n.applyOperationToCodeMirror=function(s,a){a.operation(function(){for(var t=s.ops,e=0,n=0,o=t.length;n<o;n++){var i,r=t[n];f.isRetain(r)?e+=r:f.isInsert(r)?(a.replaceRange(r,a.posFromIndex(e),null,"ignoreHistory"),e+=r.length):f.isDelete(r)&&(i=a.posFromIndex(e),r=a.posFromIndex(e-r),a.replaceRange("",i,r,"ignoreHistory"))}})},n.prototype.registerCallbacks=function(t){this.callbacks=t},n.prototype.onChange=function(){this.changeInProgress=!0},n.prototype.onChanges=function(t,e){this.ignoreNextChange||(e=n.operationFromCodeMirrorChanges(e,this.cm),this.trigger("change",e[0],e[1])),this.selectionChanged&&this.trigger("selectionChange"),this.changeInProgress=!1,this.ignoreNextChange=!1},n.prototype.onCursorActivity=n.prototype.onFocus=function(){this.changeInProgress?this.selectionChanged=!0:this.trigger("selectionChange")},n.prototype.onBlur=function(){this.cm.somethingSelected()||this.trigger("blur")},n.prototype.getValue=function(){return this.cm.getValue()},n.prototype.getSelection=function(){for(var t=this.cm,e=t.listSelections(),n=[],o=0;o<e.length;o++)n[o]=new i.Range(t.indexFromPos(e[o].anchor),t.indexFromPos(e[o].head));return new i(n)},n.prototype.setSelection=function(t){for(var e=[],n=0;t&&n<t.ranges.length;n++){var o=t.ranges[n];e[n]={anchor:this.cm.posFromIndex(o.anchor),head:this.cm.posFromIndex(o.head)}}this.cm.setSelections(e)},e={},t=document.createElement("style"),document.documentElement.getElementsByTagName("head")[0].appendChild(t),r=t.sheet;var e,t,r,s=function(t){e[t]||(e[t]=!0,r.insertRule(t,(r.cssRules||r.rules).length))};function a(t,e){var n=t[e];t[e]=function(){n.apply(t,arguments)}}return n.prototype.setOtherCursor=function(t,e,n){var t=this.cm.posFromIndex(t),o=(this.cm.cursorCoords(t),document.createElement("span"));return o.className="other-client",o.style.display="none",o.setAttribute("data-clientid",n),this.cm.setBookmark(t,{widget:o,insertLeft:!0})},n.prototype.setOtherSelectionRange=function(t,e,n){var o,i,r=/^#([0-9a-fA-F]{6})$/.exec(e);if(r)return e="."+(r="selection-"+r[1])+" { background: rgba("+(e=hex2rgb(e)).red+","+e.green+","+e.blue+",0.2); }",s(e),e=this.cm.posFromIndex(t.anchor),t=this.cm.posFromIndex(t.head),this.cm.markText(g(o=e,i=t)?o:i,g(o=e,i=t)?i:o,{className:r});throw new Error("only six-digit hex colors are allowed.")},n.prototype.setOtherSelection=function(t,e,n){for(var o=[],i=0;i<t.ranges.length;i++){var r=t.ranges[i];r.isEmpty()||(o[i]=this.setOtherSelectionRange(r,e,n))}return{clear:function(){for(var t=0;t<o.length;t++)o[t]&&o[t].clear()}}},n.prototype.trigger=function(t){var e=Array.prototype.slice.call(arguments,1),t=this.callbacks&&this.callbacks[t];t&&t.apply(this,e)},n.prototype.applyOperation=function(t){t.isNoop()||(this.ignoreNextChange=!0),n.applyOperationToCodeMirror(t,this.cm)},n.prototype.registerUndo=function(t){this.cm.undo=t},n.prototype.registerRedo=function(t){this.cm.redo=t},n})(),ot.SocketIOAdapter=(()=>{function t(t){this.socket=t;var i=this;t.on("client_left",function(t){i.trigger("client_left",t)}),t.on("set_name",function(t,e){i.trigger("set_name",t,e)}),t.on("set_color",function(t,e){i.trigger("set_color",t,e)}),t.on("ack",function(t){i.trigger("ack",t)}),t.on("operation",function(t,e,n,o){i.trigger("operation",e,n),i.trigger("selection",t,o)}),t.on("operations",function(t,e){i.trigger("operations",t,e)}),t.on("selection",function(t,e){i.trigger("selection",t,e)}),t.on("reconnect",function(){i.trigger("reconnect")})}return t.prototype.sendOperation=function(t,e,n){this.socket.emit("operation",t,e,n)},t.prototype.sendSelection=function(t){this.socket.emit("selection",t)},t.prototype.getOperations=function(t,e){this.socket.emit("get_operations",t,e)},t.prototype.registerCallbacks=function(t){this.callbacks=t},t.prototype.trigger=function(t){var e=Array.prototype.slice.call(arguments,1),t=this.callbacks&&this.callbacks[t];t&&t.apply(this,e)},t})(),ot.AjaxAdapter=(()=>{function t(t,e,n){"/"!==t[t.length-1]&&(t+="/"),this.path=t,this.ownUserName=e,this.majorRevision=n.major||0,this.minorRevision=n.minor||0,this.poll()}return t.prototype.renderRevisionPath=function(){return"revision/"+this.majorRevision+"-"+this.minorRevision},t.prototype.handleResponse=function(t){for(var e=t.operations,n=0;n<e.length;n++)e[n].user===this.ownUserName?this.trigger("ack"):this.trigger("operation",e[n].operation);0<e.length&&(this.majorRevision+=e.length,this.minorRevision=0);var o=t.events;if(o){for(n=0;n<o.length;n++){var i=o[n].user;if(i!==this.ownUserName)switch(o[n].event){case"joined":this.trigger("set_name",i,i);break;case"left":this.trigger("client_left",i);break;case"selection":this.trigger("selection",i,o[n].selection)}}this.minorRevision+=o.length}var r=t.users;r&&(delete r[this.ownUserName],this.trigger("clients",r)),t.revision&&(this.majorRevision=t.revision.major,this.minorRevision=t.revision.minor)},t.prototype.poll=function(){var e=this;$.ajax({url:this.path+this.renderRevisionPath(),type:"GET",dataType:"json",timeout:5e3,success:function(t){e.handleResponse(t),e.poll()},error:function(){setTimeout(function(){e.poll()},500)}})},t.prototype.sendOperation=function(t,e,n){if(t!==this.majorRevision)throw new Error("Revision numbers out of sync");var o=this;$.ajax({url:this.path+this.renderRevisionPath(),type:"POST",data:JSON.stringify({operation:e,selection:n}),contentType:"application/json",processData:!1,success:function(t){},error:function(){setTimeout(function(){o.sendOperation(t,e,n)},500)}})},t.prototype.sendSelection=function(t){$.ajax({url:this.path+this.renderRevisionPath()+"/selection",type:"POST",data:JSON.stringify(t),contentType:"application/json",processData:!1,timeout:1e3})},t.prototype.registerCallbacks=function(t){this.callbacks=t},t.prototype.trigger=function(t){var e=Array.prototype.slice.call(arguments,1),t=this.callbacks&&this.callbacks[t];t&&t.apply(this,e)},t})(),ot.EditorClient=(()=>{var t,r=ot.Client,s=ot.Selection,a=ot.UndoManager,p=ot.TextOperation,i=ot.WrappedOperation;function h(t,e){this.selectionBefore=t,this.selectionAfter=e}function e(t,e){this.clientId=t,this.selection=e}function n(t,e,n,o,i,r){this.id=t,this.listEl=e,this.editorAdapter=n,this.name=o,this.color=i,this.li=document.createElement("li"),o&&(this.li.textContent=o,this.listEl.appendChild(this.li)),i?this.setForceColor(i):this.setColor(o?f(o):Math.random()),r&&this.updateSelection(r)}function o(t,e,n,o){r.call(this,t),this.serverAdapter=n,this.editorAdapter=o,this.undoManager=new a,this.initializeClientList(),this.initializeClients(e);var i=this;this.editorAdapter.registerCallbacks({change:function(t,e){i.onChange(t,e)},selectionChange:function(){i.onSelectionChange()},blur:function(){i.onBlur()}}),this.editorAdapter.registerUndo(function(){i.undo()}),this.editorAdapter.registerRedo(function(){i.redo()}),this.serverAdapter.registerCallbacks({client_left:function(t){i.onClientLeft(t)},set_name:function(t,e){i.getClientObject(t).setName(e)},set_color:function(t,e){i.getClientObject(t).setForceColor(e)},ack:function(t){i.serverAck(t)},operation:function(t,e){i.applyServer(t,p.fromJSON(e))},operations:function(t,e){i.applyOperations(t,e)},selection:function(t,e){e?i.getClientObject(t).updateSelection(i.transformSelection(s.fromJSON(e))):i.getClientObject(t).removeSelection()},clients:function(t){var e,n;for(e in i.clients)i.clients.hasOwnProperty(e)&&!t.hasOwnProperty(e)&&i.onClientLeft(e);for(e in t)t.hasOwnProperty(e)&&(n=i.getClientObject(e),t[e].name&&n.setName(t[e].name),(n=t[e].selection)?i.clients[e].updateSelection(i.transformSelection(s.fromJSON(n))):i.clients[e].removeSelection())},reconnect:function(){i.serverReconnect()}})}function c(){}function l(t,e,n){function o(t){t=Math.round(255*t).toString(16);return 1===t.length?"0"+t:t}return"#"+o(t)+o(e)+o(n)}function u(t,e,n){var o,i;return 0===e?l(n,n,n):(i=2*n-(o=n<.5?n*(1+e):n+e-e*n),l((e=function(t){return t<0&&(t+=1),1<t&&--t,6*t<1?i+6*(o-i)*t:2*t<1?o:3*t<2?i+6*(o-i)*(2/3-t):i})(t+1/3),e(t),e(t-1/3)))}function f(t){for(var e=1,n=0;n<t.length;n++)e=17*(e+t.charCodeAt(n))%360;return e/360}return h.prototype.invert=function(){return new h(this.selectionAfter,this.selectionBefore)},h.prototype.compose=function(t){return new h(this.selectionBefore,t.selectionAfter)},h.prototype.transform=function(t){return new h(this.selectionBefore?this.selectionBefore.transform(t):null,this.selectionAfter?this.selectionAfter.transform(t):null)},e.fromJSON=function(t){return new e(t.clientId,t.selection&&s.fromJSON(t.selection))},e.prototype.transform=function(t){return new e(this.clientId,this.selection&&this.selection.transform(t))},n.prototype.setColor=function(t){this.hue=t,this.color=u(t,.75,.5),this.lightColor=u(t,.5,.9),this.li&&(this.li.style.color=this.color)},n.prototype.setForceColor=function(t){this.hue=null,this.color=t,this.lightColor=t,this.li&&(this.li.style.color=this.color)},n.prototype.setName=function(t){this.name!==t&&(this.name=t,this.li.textContent=t,this.li.parentNode||this.listEl.appendChild(this.li),this.setColor(f(t)))},n.prototype.updateSelection=function(t){this.removeSelection(),this.selection=t,this.mark=this.editorAdapter.setOtherSelection(t,t.position===t.selectionEnd?this.color:this.lightColor,this.id)},n.prototype.remove=function(){var t;this.li&&(t=this.li).parentNode&&t.parentNode.removeChild(t),this.removeSelection()},n.prototype.removeSelection=function(){this.mark&&(this.mark.clear(),this.mark=null)},t=o,c.prototype=r.prototype,t.prototype=new c,t.prototype.constructor=t,o.prototype.addClient=function(t,e){this.clients[t]=new n(t,this.clientListEl,this.editorAdapter,e.name||t,e.color||null,e.selection?s.fromJSON(e.selection):null)},o.prototype.initializeClients=function(t){for(var e in this.clients={},t)t.hasOwnProperty(e)&&this.addClient(e,t[e])},o.prototype.getClientObject=function(t){var e=this.clients[t];return e||(this.clients[t]=new n(t,this.clientListEl,this.editorAdapter))},o.prototype.onClientLeft=function(t){var e=this.clients[t];e&&(e.remove(),delete this.clients[t])},o.prototype.initializeClientList=function(){this.clientListEl=document.createElement("ul")},o.prototype.applyUnredo=function(t){this.undoManager.add(t.invert(this.editorAdapter.getValue())),this.editorAdapter.applyOperation(t.wrapped),this.selection=t.meta.selectionAfter,this.editorAdapter.setSelection(this.selection),this.applyClient(t.wrapped)},o.prototype.undo=function(){var e=this;this.undoManager.canUndo()&&this.undoManager.performUndo(function(t){e.applyUnredo(t)})},o.prototype.redo=function(){var e=this;this.undoManager.canRedo()&&this.undoManager.performRedo(function(t){e.applyUnredo(t)})},o.prototype.onChange=function(t,e){var n=this.selection,o=(this.updateSelection(),new h(n,this.selection)),o=(new i(t,o),0<this.undoManager.undoStack.length&&e.shouldBeComposedWithInverted((o=this.undoManager.undoStack)[o.length-1].wrapped)),n=new h(this.selection,n);this.undoManager.add(new i(e,n),o),this.applyClient(t)},o.prototype.updateSelection=function(){this.selection=this.editorAdapter.getSelection()},o.prototype.onSelectionChange=function(){var t=this.selection;this.updateSelection(),t&&this.selection.equals(t)||this.sendSelection(this.selection)},o.prototype.onBlur=function(){this.selection=null,this.sendSelection(null)},o.prototype.sendSelection=function(t){this.state instanceof r.AwaitingWithBuffer||this.serverAdapter.sendSelection(t)},o.prototype.sendOperation=function(t,e){this.serverAdapter.sendOperation(t,e.toJSON(),this.selection)},o.prototype.getOperations=function(t,e){this.serverAdapter.getOperations(t,e)},o.prototype.applyOperation=function(t){this.editorAdapter.applyOperation(t),this.updateSelection(),this.undoManager.transform(new i(t,null))},o})();
diff --git a/yarn.lock b/yarn.lock
index 36d6652a..e6dbb6ac 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -1635,6 +1635,7 @@ __metadata:
     string-loader: "npm:0.0.1"
     toobusy-js: "npm:0.5.1"
     turndown: "npm:7.2.2"
+    uglify-js: "npm:3.19.3"
     umzug: "npm:2.3.0"
     url-loader: "npm:4.1.1"
     utf-8-validate: "npm:6.0.6"
@@ -16658,6 +16659,15 @@ __metadata:
   languageName: node
   linkType: hard
 
+"uglify-js@npm:3.19.3":
+  version: 3.19.3
+  resolution: "uglify-js@npm:3.19.3"
+  bin:
+    uglifyjs: bin/uglifyjs
+  checksum: 10/6b9639c1985d24580b01bb0ab68e78de310d38eeba7db45bec7850ab4093d8ee464d80ccfaceda9c68d1c366efbee28573b52f95e69ac792354c145acd380b11
+  languageName: node
+  linkType: hard
+
 "uid-safe@npm:~2.1.5":
   version: 2.1.5
   resolution: "uid-safe@npm:2.1.5"