added IsSizeDeferred() (part of patch 1199639)

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@35350 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

include/wx/msw/window.h

@@ -166,6 +166,9 @@ public:
     void AssociateHandle(WXWidget handle);
     void DissociateHandle();
 
+    // does this window have deferred position and/or size?
+    bool IsSizeDeferred() const;
+
 
     // implementation from now on
     // ==========================