Added a comment about the 'UpdateWindow' issue in SetScrollBars()

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@5385 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

src/generic/scrolwin.cpp

@@ -157,6 +157,12 @@ void wxScrolledWindow::SetScrollbars (int pixelsPerUnitX, int pixelsPerUnitY,
         m_targetWindow->Refresh(); 
    
 #ifdef __WXMSW__
+    // GRG: if this turns out to be really necessary, we could
+    //   at least move it to the above if { ... } so that it is
+    //   only done if noRefresh = FALSE (the default). OTOH, if
+    //   this doesn't break anything, which seems to be the
+    //   case, we could just leave it out.
+
     // Necessary?
     // UpdateWindow ((HWND) m_targetWindow->GetHWND());
 #endif