Added MacInternalOnSize() to allow windows to resize themselves independently of size events

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@70765 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

include/wx/osx/window.h

@@ -288,6 +288,9 @@ public:
     
     float               GetContentScaleFactor() const ;
     
+    // internal response to size events
+    virtual void MacOnInternalSize() {}
+
 protected:
     // For controls like radio buttons which are genuinely composite
     wxList              m_subControls;