DevTools: [Console] Separate height caching from willHide event

Source/devtools/front_end/console/ConsoleViewMessage.js

 /*
  * Copyright (C) 2011 Google Inc.  All rights reserved.
  * Copyright (C) 2007, 2008 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
@@ skipping 66 matching lines @@
     wasShown: function()
     {
         for (var i = 0; this._dataGrids && i < this._dataGrids.length; ++i) {
             var dataGrid = this._dataGrids[i];
             var parentElement = this._dataGridParents.get(dataGrid) || null;
             dataGrid.show(parentElement);
             dataGrid.updateWidths();
         }
     },
 
+    cacheFastHeight: function()
+    {
+        this._cachedHeight = this.contentElement().clientHeight;
+    },
+
     willHide: function()
     {
-        this._cachedHeight = this.contentElement().clientHeight;
         for (var i = 0; this._dataGrids && i < this._dataGrids.length; ++i) {
             var dataGrid = this._dataGrids[i];
             this._dataGridParents.put(dataGrid, dataGrid.element.parentElement);
             dataGrid.detach();
         }
     },
 
     /**
      * @return {number}
      */
@@ skipping 1137 matching lines @@
     {
         if (!this._wrapperElement) {
             WebInspector.ConsoleViewMessage.prototype.toMessageElement.call(this);
             this._wrapperElement.classList.toggle("collapsed", this._collapsed);
         }
         return this._wrapperElement;
     },
 
     __proto__: WebInspector.ConsoleViewMessage.prototype
 }