X-Git-Url: https://git.saurik.com/wxWidgets.git/blobdiff_plain/f204026b42dd36af2716434232dd1937fab2465e..606b005fb2b535b34d1ca45d2d06ee86718e8b1c:/src/msw/bitmap.cpp

diff --git a/src/msw/bitmap.cpp b/src/msw/bitmap.cpp
index 4c21494fcb..437a6c4452 100644
--- a/src/msw/bitmap.cpp
+++ b/src/msw/bitmap.cpp
@@ -1039,6 +1039,10 @@ bool wxMask::Create(const wxBitmap& bitmap, const wxColour& colour)
 
     bool ok = TRUE;
 
+    // SelectObject() will fail
+    wxASSERT_MSG( !bitmap.GetSelectedInto(),
+                  _T("bitmap can't be selected in another DC") );
+
     HGDIOBJ hbmpSrcOld = ::SelectObject(srcDC, GetHbitmapOf(bitmap));
     if ( !hbmpSrcOld )
     {