Editor textarea resizes automatically, so manual resizing is now diabled

src/frontend/css/editor.css

@@ -12,11 +12,11 @@ body {
 }
 
 .math-input {
-    width: 436px !important;
     min-height: 314px;
     padding: 7px 11px;
     line-height: 26px;
     overflow: hidden;
+    resize: none;
 }
 
 .pretty-print {