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/gtk1/textctrl.h

@@ -139,11 +139,6 @@ public:
 
     void SetModified() { m_modified = true; }
 
-    // GTK+ textctrl is so dumb that you need to freeze/thaw it manually to
-    // avoid horrible flicker/scrolling back and forth
-    virtual void Freeze();
-    virtual void Thaw();
-
     // textctrl specific scrolling
     virtual bool ScrollLines(int lines);
     virtual bool ScrollPages(int pages);
@@ -170,6 +165,10 @@ protected:
     // common part of all ctors
     void Init();
 
+    // overridden wxWindow methods
+    virtual void DoFreeze();
+    virtual void DoThaw();
+
     // get the vertical adjustment, if any, NULL otherwise
     GtkAdjustment *GetVAdj() const;