glamor: Fix dashed line rendering.
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 <firstname.lastname@example.org> Reviewed-by: Keith Packard <email@example.com> Reviewed-by: Michel Dänzer <firstname.lastname@example.org>
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