Merged trunk 47757:

* Implement the wxMask copy constructor to retain the source object's
  m_cocoaNSBitmapImageRep (fixes multiple release bug).
* Add some debug messages for unimplemented wxMask::Create overloads.
* Implement mask creation w/ key color from 8-bpp grayscale bitmap.
  This makes the mask image in the drawing sample's mask page work.


git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/branches/WX_2_8_BRANCH@47759 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

include/wx/cocoa/bitmap.h

@@ -43,6 +43,9 @@ public:
     // Construct a mask from a mono bitmap (copies the bitmap).
     wxMask(const wxBitmap& bitmap);
 
+    // Copy constructor
+    wxMask(const wxMask& src);
+
     virtual ~wxMask();
 
     bool Create(const wxBitmap& bitmap, const wxColour& colour);