DevTools: [SSP] consume event if it inserts a new property

Source/devtools/front_end/elements/StylesSidebarPane.js

 /*
  * Copyright (C) 2007 Apple Inc.  All rights reserved.
  * Copyright (C) 2009 Joseph Pecoraro
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  *
  * 1.  Redistributions of source code must retain the above copyright
  *     notice, this list of conditions and the following disclaimer.
@@ skipping 1581 matching lines @@
     {
         var willCauseCancelEditing = this._willCauseCancelEditing;
         delete this._willCauseCancelEditing;
         return willCauseCancelEditing;
     },
 
     _handleSelectorContainerClick: function(event)
     {
         if (this._checkWillCancelEditing() || !this.editable)
             return;
-        if (event.target === this._selectorContainer)
+        if (event.target === this._selectorContainer) {
             this.addNewBlankProperty(0).startEditing();
+            event.consume(true);
+        }
     },
 
     /**
      * @param {number=} index
      * @return {!WebInspector.StylePropertyTreeElement}
      */
     addNewBlankProperty: function(index)
     {
         var style = this.styleRule.style;
         var property = style.newBlankProperty(index);
@@ skipping 76 matching lines @@
 
         if (this._checkWillCancelEditing())
             return;
 
         if (event.target.classList.contains("header") || this.element.classList.contains("read-only") || event.target.enclosingNodeOrSelfWithClass("media")) {
             event.consume();
             return;
         }
         this.expand();
         this.addNewBlankProperty().startEditing();
+        event.consume(true)
     },
 
     _handleSelectorClick: function(event)
     {
         if (WebInspector.KeyboardShortcut.eventHasCtrlOrMeta(event) && this.navigable && event.target.classList.contains("simple-selector")) {
             var index = event.target._selectorIndex;
             var target = this._parentPane._target;
             var rawLocation = new WebInspector.CSSLocation(target, this.rule.styleSheetId, this.rule.sourceURL, this.rule.lineNumberInSource(index), this.rule.columnNumberInSource(index));
             var uiLocation = WebInspector.cssWorkspaceBinding.rawLocationToUILocation(rawLocation);
             WebInspector.Revealer.reveal(uiLocation);
@@ skipping 1807 matching lines @@
         if (userEnteredText && (userEnteredText === userEnteredText.toUpperCase())) {
             for (var i = 0; i < results.length; ++i)
                 results[i] = results[i].toUpperCase();
         }
         var selectedIndex = this._cssCompletions.mostUsedOf(results);
         completionsReadyCallback(results, selectedIndex);
     },
 
     __proto__: WebInspector.TextPrompt.prototype
 }