Fix Subclassing To Support Nested Messages

[Robert Shearman]

Hi,

This bug kept me amused for a few hours. If a subclassed window received
a WM_PAINT message, for example, then DefWndProc would fire off a
WM_ERASEBKGND to the subclassed window proc again. Previously this would
call the original procedure immediately as it didn't save
stack->stackpos across nested messages and the subclassing proc wouldn't
receive the message. This patch fixes this bug.

Changelog:
Fix Subclassing To Support Nested Messages

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