DevTools: follow up to the widget hierarchy change, account for local widget reparending.

third_party/WebKit/Source/devtools/front_end/ui/Widget.js

 /*
  * Copyright (C) 2008 Apple Inc. All Rights Reserved.
  * Copyright (C) 2011 Google Inc. All Rights Reserved.
  *
  * 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.
  * 2. Redistributions in binary form must reproduce the above copyright
@@ skipping 238 matching lines @@
     {
         var currentParent = parentElement;
         while (currentParent && !currentParent.__widget)
             currentParent = currentParent.parentElementOrShadowHost();
 
         if (this._isRoot)
             WebInspector.Widget.__assert(!currentParent, "Attempt to show root widget under another widget");
         else
             WebInspector.Widget.__assert(currentParent && currentParent.__widget === this._parentWidget, "Attempt to show under node belonging to alien widget");
 
-        if (this._visible)
+        var wasVisible = this._visible;
+        if (wasVisible && this.element.parentElement === parentElement)
             return;
+
         this._visible = true;
 
-        if (this._parentIsShowing())
+        if (!wasVisible && this._parentIsShowing())
             this._processWillShow();
 
         this.element.classList.remove("hidden");
 
         // Reparent
         if (this.element.parentElement !== parentElement) {
             WebInspector.Widget._incrementWidgetCounter(parentElement, this.element);
             if (insertBefore)
                 WebInspector.Widget._originalInsertBefore.call(parentElement, this.element, insertBefore);
             else
                 WebInspector.Widget._originalAppendChild.call(parentElement, this.element);
         }
 
-        if (this._parentIsShowing())
+        if (!wasVisible && this._parentIsShowing())
             this._processWasShown();
 
         if (this._parentWidget && this._hasNonZeroConstraints())
             this._parentWidget.invalidateConstraints();
         else
             this._processOnResize();
     },
 
     hideWidget: function()
     {
@@ skipping 495 matching lines @@
 {
     WebInspector.Widget.__assert(!child.__widgetCounter && !child.__widget, "Attempt to remove element containing widget via regular DOM operation");
     return WebInspector.Widget._originalRemoveChild.call(this, child);
 }
 
 Element.prototype.removeChildren = function()
 {
     WebInspector.Widget.__assert(!this.__widgetCounter, "Attempt to remove element containing widget via regular DOM operation");
     WebInspector.Widget._originalRemoveChildren.call(this);
 }