* 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/tbargtk.cpp

@@ -501,6 +501,7 @@ bool wxToolBar::DoInsertTool(size_t pos, wxToolBarToolBase *toolBase)
         (m_widget, &req );
     m_width = req.width + m_xMargin;
     m_height = req.height + 2*m_yMargin;
+    InvalidateBestSize();
 
     return TRUE;
 }
@@ -522,6 +523,7 @@ bool wxToolBar::DoDeleteTool(size_t WXUNUSED(pos), wxToolBarToolBase *toolBase)
         //case wxTOOL_STYLE_SEPARATOR: -- nothing to do
     }
 
+    InvalidateBestSize();
     return TRUE;
 }