[Bug 71260] SNA in zaphod mode (multiple screens) has rendering issues with Xnest

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=71260

--- Comment #13 from intelgraphics7 at gmx-topmail.de ---
I've just tried the latest GIT version of the driver and it seems that the
"sna: Always copy from the tile source" fix helps my issue somewhat. It seems
to fix the drawing issues in i.e. the gtk file dialog or the "Application
Launcher" when referring to my screenshots.

I've done some further investigations and I've found out that when I comment
out the sna_poly_fill_rect_tiled_nxm_blt() call in
sna_poly_fill_rect_tiled_blt() I don't get corruptions anymore when I move a
window over the xfce-terminal.

... sna_poly_fill_rect_tiled_blt(...)
{
    ...
#if 0
    if ((tile->drawable.width | tile->drawable.height) <= 0xc &&
        is_power_of_two(tile->drawable.width) &&
        is_power_of_two(tile->drawable.height))
        return sna_poly_fill_rect_tiled_nxm_blt(drawable, bo, damage,
                            gc, n, rect,
                            extents, clipped);
#endif
    ...
}

Is there a bug in the condition around the sna_poly_fill_rect_tiled_nxm_blt()
or is there an issue in the function itself?

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