* 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/statbmp.cpp

@@ -113,7 +113,8 @@ void wxStaticBitmap::SetBitmap( const wxBitmap &bitmap )
             gtk_pixmap_set( GTK_PIXMAP(m_widget), m_bitmap.GetPixmap(), mask );
         }
 
-        SetBestSize(wxSize(bitmap.GetWidth(), bitmap.GetHeight()));
+        InvalidateBestSize();
+        SetSize(GetBestSize());
     }
 }