[PATCH xserver] miext/damage: take care of the coordinate mode in damagePolyPoint

[Eric Anholt]

Cedric Roux <sed at free.fr> writes:

> The mode (CoordModeOrigin or CoordModePrevious) was not taken into
> account when computing the box. The result was a bad drawing of
> points in some situations (on my hardware/software configuration,
> calling XDrawString followed by XDrawPoints in the mode
> CoordModePrevious).
>
> Signed-off-by: Cedric Roux <sed at free.fr>

Thanks for the fix!  I wrote up a little testsuite for damage that we
can use to test these bugs in the future and made a MR for the whole
thing:

https://gitlab.freedesktop.org/xorg/xserver/merge_requests/23
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