Crash while resizing window in Windows 3.11 with CL-GD5446 driver

[Vort]

When window is moved or resized in certain way in Windows 3.11 with CL-GD5446 video card, stack overflow happens.

To reproduce this problem:

1. Switch to 640x480x8 resolution;
2. Move Program Manager window to the bottom right corner of the screen, like so:
   
3. Start enlarging this window by dragging its top left corner;
4. When mouse cursor will be close to the top left corner of the screen, Bochs will crash:
   

Stack overflow happens here:

Bochs/bochs/iodev/display/svga_cirrus.cc

Lines 459 to 461 in 4a32e42

	if ((x0 + width) > svga_xres) {
	BX_CIRRUS_THIS redraw_area(0, y0 + 1, width, height);
	}

when x0 = 0, width = 641 and svga_xres = 640.

Version: 4a32e42.

[vruppert]

I cannot reproduce this issue here, but this piece of code looks incorrect to me. I have added this code to fix issue #221, but it must fail with the input values you mentioned. I have now applied a more correct version.

[Vort]

No more crash with 85c58ff, thank you.

However, while slowly moving partially hidden window I noticed small glitches (dotted lines):