Application clipping region can be set to null without affecting

paint clipping region. This fixes severe refresh problems on WinCE
when clipping regions are used, and is experimental on desktop wxMSW
but so far works fine.


git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@37777 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

src/msw/dc.cpp

@@ -483,6 +483,14 @@ void wxDC::DestroyClippingRegion()
 
     if (m_clipping && m_hDC)
     {
+#if 1
+        // On a PocketPC device (not necessarily emulator), resetting
+        // the clip region as per the old method causes bad display
+        // problems. In fact setting a null region is probably OK
+        // on desktop WIN32 also, since the WIN32 docs imply that the user
+        // clipping region is independent from the paint clipping region.
+        ::SelectClipRgn(GetHdc(), 0);
+#else        
         // TODO: this should restore the previous clipping region,
         //       so that OnPaint processing works correctly, and the update
         //       clipping region doesn't get destroyed after the first
@@ -490,6 +498,7 @@ void wxDC::DestroyClippingRegion()
         HRGN rgn = CreateRectRgn(0, 0, 32000, 32000);
         ::SelectClipRgn(GetHdc(), rgn);
         ::DeleteObject(rgn);
+#endif        
     }
 
     wxDCBase::DestroyClippingRegion();