cache best size in DoGetBestSize()

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@39080 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

src/common/treebase.cpp

@@ -120,6 +120,8 @@ wxSize wxTreeCtrlBase::DoGetBestSize() const
     // need some minimal size even for empty tree
     if ( !size.x || !size.y )
         size = wxControl::DoGetBestSize();
+    else
+        CacheBestSize(size);
 
     return size;
 }