move Freeze() and Thaw() to wxWindowBase to ensure that they behave consistently (i.e. recursively, as described in the docs) in all ports; removed different duplications of freeze count from derived classes

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@51018 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

include/wx/dfb/window.h

@@ -75,9 +75,6 @@ public:
     virtual void Refresh(bool eraseBackground = true,
                          const wxRect *rect = (const wxRect *) NULL);
     virtual void Update();
-    virtual void Freeze();
-    virtual void Thaw();
-    virtual bool IsFrozen() const { return m_frozenness > 0; }
 
     virtual bool SetCursor(const wxCursor &cursor);
     virtual bool SetFont(const wxFont &font) { m_font = font; return true; }
@@ -128,6 +125,8 @@ protected:
     virtual void DoCaptureMouse();
     virtual void DoReleaseMouse();
 
+    virtual void DoThaw();
+
     // move the window to the specified location and resize it: this is called
     // from both DoSetSize() and DoSetClientSize() and would usually just call
     // ::MoveWindow() except for composite controls which will want to arrange
@@ -183,9 +182,6 @@ private:
     // don't access it directly)
     wxRect m_rect;
 
-    // number of calls to Freeze() minus number of calls to Thaw()
-    unsigned m_frozenness;
-
     // overlays for this window (or NULL if it doesn't have any)
     wxDfbOverlaysList *m_overlays;