* 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/gtk1/bmpbuttn.cpp

@@ -205,6 +205,8 @@ void wxBitmapButton::OnSetBitmap()
 {
     wxCHECK_RET( m_widget != NULL, wxT("invalid bitmap button") );
 
+    InvalidateBestSize();
+    
     wxBitmap the_one;
     if (!m_isEnabled)
         the_one = m_bmpDisabled;
@@ -258,6 +260,7 @@ wxSize wxBitmapButton::DoGetBestSize() const
         best.x = m_bmpNormal.GetWidth()+border;
         best.y = m_bmpNormal.GetHeight()+border;
     }
+    CacheBestSize(best);
     return best;
 }