added wxWindow::Freeze/Thaw(), implemented them for wxGTK::wxTextCtrl

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@11176 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

include/wx/window.h

@@ -519,6 +519,12 @@ public:
         // clear the window entirely
     virtual void Clear() = 0;
 
+        // freeze the window: don't redraw it until it is thawed
+    virtual void Freeze() { }
+
+        // thaw the window: redraw it after it had been frozen
+    virtual void Thaw() { }
+
         // adjust DC for drawing on this window
     virtual void PrepareDC( wxDC & WXUNUSED(dc) ) { }