DevTools: [Sources] Make typing faster when search is open

third_party/WebKit/Source/devtools/front_end/source_frame/SourcesTextEditor.js

 // Copyright (c) 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 /**
  * @unrestricted
  */
 WebInspector.SourcesTextEditor = class extends WebInspector.CodeMirrorTextEditor {
   /**
    * @param {!WebInspector.SourcesTextEditorDelegate} delegate
    */
@@ skipping 777 matching lines @@
       this._searchResultMarker.clear();
       delete this._searchResultMarker;
     }
     if (this._highlightDescriptor && this._highlightDescriptor.selectionStart)
       this._codeMirror.removeLineClass(this._highlightDescriptor.selectionStart.line, 'wrap', 'cm-line-with-selection');
     var selectionStart = this._highlightRange ?
         new CodeMirror.Pos(this._highlightRange.startLine, this._highlightRange.startColumn) :
         null;
     if (selectionStart)
       this._codeMirror.addLineClass(selectionStart.line, 'wrap', 'cm-line-with-selection');
-    if (this._highlightRegex === oldRegex) {
+    if (oldRegex && this._highlightRegex.toString() === oldRegex.toString()) {
       // Do not re-add overlay mode if regex did not change for better performance.
       if (this._highlightDescriptor)
         this._highlightDescriptor.selectionStart = selectionStart;
     } else {
       this._removeHighlight();
       this._setHighlighter(this._searchHighlighter.bind(this, this._highlightRegex), selectionStart);
     }
     if (this._highlightRange) {
       var pos = WebInspector.CodeMirrorUtils.toPos(this._highlightRange);
       this._searchResultMarker = this._codeMirror.markText(pos.start, pos.end, {className: 'cm-column-with-selection'});
@@ skipping 103 matching lines @@
    */
   _setHighlighter(highlighter, selectionStart) {
     var overlayMode = {token: highlighter};
     this._codeMirror.addOverlay(overlayMode);
     this._highlightDescriptor = {overlay: overlayMode, selectionStart: selectionStart};
   }
 };
 
 WebInspector.SourcesTextEditor.LinesToScanForIndentationGuessing = 1000;
 WebInspector.SourcesTextEditor.MaximumNumberOfWhitespacesPerSingleSpan = 16;