[PATCH xserver] glamor: Fix dashed line rendering.

[Eric Anholt]

Keith Packard <keithp at keithp.com> writes:

> [ Unknown signature status ]
> Eric Anholt <eric at anholt.net> writes:
>
>> We were binding the screen pixmap as the dash and sampling its alpha,
>> which is usually just 1.0 (no dashing at all).
>>
>> Please cherry-pick this to active stable branches.
>>
>> Signed-off-by: Eric Anholt <eric at anholt.net>
>
> Thank you for finding this!
>
> Reviewed-by: Keith Packard <keithp at keithp.com>
>
> Now, can you explain why it ever did anything reasonable at all?

I'm sure that was just some pre-refactor version.  Sadly, xts doesn't
actually test dashes at all.
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