* Implemented BestSize cache

* Added calls to InvalidateBestSize where things affecting BestSize
  are modified.  There are probably several other places where this
  still needs to be done...

* Added wxWindowBase::GetBestFittingSize that will merge the BestSize
  into the MinSize, (if any) and return the result.

* SetBestFittingSize will now only set the MinSize to the value that
  was passed to it, without merging in the BestSize


git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@28010 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

src/gtk/control.cpp

@@ -66,6 +66,7 @@ void wxControl::SetLabel( const wxString &label )
         }
         m_label << *pc;
     }
+    InvalidateBestSize();    
 }
 
 wxString wxControl::GetLabel() const
@@ -85,7 +86,9 @@ wxSize wxControl::DoGetBestSize() const
     (* GTK_WIDGET_CLASS( GTK_OBJECT_GET_CLASS(m_widget) )->size_request )
         (m_widget, &req );
 
-    return wxSize(req.width, req.height);
+    wxSize best(req.width, req.height);
+    CacheBestSize(best);
+    return best;
 }