[DevTools] Properly update resizer in SourcesPanel.

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

 /*
  * Copyright (C) 2012 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.
  *
@@ skipping 272 matching lines @@
     /**
      * @param {boolean} minimized
      */
     setSidebarMinimized: function(minimized)
     {
         this._sidebarMinimized = minimized;
         this.invalidateConstraints();
     },
 
     /**
+     * @return {boolean}
+     */
+    isSidebarMinimized: function()
+    {
+        return this._sidebarMinimized;
+    },
+
+    /**
      * @param {!WebInspector.Widget} sideToShow
      * @param {!WebInspector.Widget} sideToHide
      * @param {!Element} shadowToShow
      * @param {!Element} shadowToHide
      * @param {boolean=} animate
      */
     _showOnly: function(sideToShow, sideToHide, shadowToShow, shadowToHide, animate)
     {
         this._cancelAnimation();
 
@@ skipping 602 matching lines @@
         this._showHideSidebarButton.classList.toggle("toggled-hide", !sidebarHidden);
         this._showHideSidebarButton.classList.toggle("top-sidebar-show-hide-button", !this.isVertical() && !this.isSidebarSecond());
         this._showHideSidebarButton.classList.toggle("right-sidebar-show-hide-button", this.isVertical() && this.isSidebarSecond());
         this._showHideSidebarButton.classList.toggle("bottom-sidebar-show-hide-button", !this.isVertical() && this.isSidebarSecond());
         this._showHideSidebarButton.classList.toggle("left-sidebar-show-hide-button", this.isVertical() && !this.isSidebarSecond());
         this._showHideSidebarButton.title = sidebarHidden ? WebInspector.UIString("Show %s", this._showHideSidebarButtonTitle) : WebInspector.UIString("Hide %s", this._showHideSidebarButtonTitle);
     },
 
     __proto__: WebInspector.Widget.prototype
 }