Use a GtkVBox to do TLW layout. Rework some of the remaining sizing code.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@49406 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

include/wx/gtk/toplevel.h

@@ -83,14 +83,11 @@ public:
     // --------------------------
 
     // GTK callbacks
-    virtual void GtkOnSize();
     virtual void OnInternalIdle();
 
     // do *not* call this to iconize the frame, this is a private function!
     void SetIconizeState(bool iconic);
 
-    int           m_miniEdge,
-                  m_miniTitle;
     GtkWidget    *m_mainWidget;
 
     bool          m_fsIsShowing;         /* full screen */
@@ -101,8 +98,6 @@ public:
     int           m_gdkFunc,
                   m_gdkDecor;
 
-    bool m_sizeSet;
-
     // private gtk_timeout_add result for mimicing wxUSER_ATTENTION_INFO and
     // wxUSER_ATTENTION_ERROR difference, -2 for no hint, -1 for ERROR hint, rest for GtkTimeout handle.
     int m_urgency_hint;
@@ -116,8 +111,6 @@ public:
     // return the size of the window without WM decorations
     void GTKDoGetSize(int *width, int *height) const;
 
-    void GtkUpdateSize() { m_sizeSet = false; }
-
     // whether frame extents are accurate
     virtual bool IsDecorCacheable() const;
 
@@ -139,6 +132,7 @@ protected:
     // string shown in the title bar
     wxString m_title;
 
+private:
     // is the frame currently iconized?
     bool m_isIconized;