wxDC usage in a thread

[Harry]

Hi,

I've encountered memory corruption errors when allocating wxDC on the 
stack in a thread,
although in theory that's supposed to be possible.

After hours of debug, I've finally found the problem in the definition 
of class wxDCBase in dc.h,
which specifies the following member initialization:
        , m_backgroundBrush(*wxTRANSPARENT_BRUSH)

As the stock item wxTRANSPARENT_BRUSH is probably already allocated by 
and used by
the main thread, its concurrent usage from a thread may destroy its 
reference counting,
since reference counting isn't thread-safe.

I've solved the problem by replacing this member initialization by:
        , m_backgroundBrush()

Does anybody have an objection to this, before I contribute it as a patch ?

Regards
Harry