Fixed wxComboCtrl::SetButtonPosition() on Vista/Win7 by marking the drop-down button as 'non-standard' when its size or position is changed

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@64410 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

include/wx/combo.h

@@ -95,7 +95,8 @@ enum
     // Internal use: Skip popup animation.
     wxCC_IFLAG_DISABLE_POPUP_ANIM   = 0x2000,
     // Internal use: Drop-button is a bitmap button or has non-default size
-    // (but can still be on either side of the control).
+    // (but can still be on either side of the control), regardless whether
+    // specified by the platform or the application.
     wxCC_IFLAG_HAS_NONSTANDARD_BUTTON   = 0x4000
 };