Many changes:

- Introduced GTKGetWindow() which returns all GdkWindows associated with the
  given wxWindow
- Renamed IsOwnGtkWindow() to GTKIsOwnWindow() to avoid confusion with the old
  virtual function (the new one is non-virtual and is implemented in terms of
  GTKGetWindow())
- Refactored/simplified event handlers code in gtk/window.cpp
- Fixed some header guards names (__GTKFOO__ -> _WX_GTK_FOO_H_)
- Added GTKUpdateCursor() which sets the current cursor for all windows
  returned by GTKGetWindow()
- Factored out code from many different classes in wxControl::OnInternalIdle()
  which now updates the cursor, checks for internal focus and sends update UI
  events


git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@40815 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

include/wx/gtk/button.h

@@ -61,8 +61,6 @@ public:
     // implementation
     // --------------
 
-    bool IsOwnGtkWindow( GdkWindow *window );
-
     // Since this wxButton doesn't derive from wxButtonBase (why?) we need
     // to override this here too...
     virtual bool ShouldInheritColours() const { return false; }
@@ -75,7 +73,9 @@ public:
 
 protected:
     virtual wxSize DoGetBestSize() const;
-    void DoApplyWidgetStyle(GtkRcStyle *style);
+    virtual void DoApplyWidgetStyle(GtkRcStyle *style);
+
+    virtual GdkWindow *GTKGetWindow(wxArrayGdkWindows& windows) const;
 
 private:
     DECLARE_DYNAMIC_CLASS(wxButton)