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/slider.h

@@ -60,12 +60,13 @@ public:
     GetClassDefaultAttributes(wxWindowVariant variant = wxWINDOW_VARIANT_NORMAL);
     
     // implementation
-    bool IsOwnGtkWindow( GdkWindow *window );
-
     double m_pos;
     int m_scrollEventType;
     bool m_needThumbRelease;
 
+protected:
+    virtual GdkWindow *GTKGetWindow(wxArrayGdkWindows& windows) const;
+
 private:
     DECLARE_DYNAMIC_CLASS(wxSlider)
 };