Only on the IIIc.  Fatal Exception.

I've traced a crash on the IIIc to the following line:

        WinCopyRectangle(NULL, NULL, &r, dx, dy, winPaint);

when r.topLeft.x is zero.  Not always, and in a different app, even if
that is nonzero, but r.topLeft.y is zero.  dx is nonzero, as are the
extents.  Normally there will be overlap:

D---+
|   |
| S-+-+
| | | |
+-+-+ |
  |   |
  +---+

I get a fatal exception on the IIIc, but not on the V or Vx.  And it
happens in 1 bpp and 8 bpp, but apparently not 4bpp.

In 8bpp, changing r.tL.x to 1 I can't get it to crash.

Forcing 4bpp I haven't gotten it to crash either.

This is with 3.5.2.

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