[AD] windows redraw bug

["Javier Gonzalez" <Xavier_Gonzalez@xxxxxxxxxx>]

Using winxp, alleg 4.1.9wip (probably on 4.0.3 too)

Hi, I just noticed that when using directdraw windowed mode in the same bpp
than the desktop, when you move the window fast (and the option to move the
whole window (not just the frame) is on), the window leaves some artifacts
even after dropped.
This doesn't appear in programs using double buffer, or in other bpps since
the automatic conversion uses double buffer.
This can be easily tested using a program that doesn't use double buffer,
for example exswitch.

Well, that above was a bit criptic but I hope you understand it, I'm kinda
in a hurry :)

Anyway, the attached patch, that forces the window to redraw itself in each
WM_MOVE message fixes the problem (tested).
Note it uses RedrawWindow() since UpdateWindow() doesn't work because it
doesn't invalidate the region.

Thanks for your time.

Attachment: wwnd.c.diff
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