Created attachment 85987 [details]
When you move mouse over the rounded graph in Gnome Disk Usage Analyzer, there occasionally appears black thin vertical lines. This doesn't happen with UXA. Screenshot atached.
As anticipated it is a seam introduced by the Imprecise trapezoidation. Not sure yet if it is fixable.
Hmm, actually the corruption is always on the very left of the rendered area - so an artifact of the trapezoid clipping.
My apologies for assuming that this was just an Imprecise trapezoid artifact and not giving it the attention it deserved.
Author: Chris Wilson <firstname.lastname@example.org>
Date: Mon Sep 30 23:34:02 2013 +0100
sna/trapezoids: Fix clipping on the far left
Edges that extend past the left hand side of the clip box cannot simply
be ignored (since they contribute to the scanline to their right, our
region of interest) but they need to calculated separately rather than
merged into the first cell.
Reported-by: Pavel Ondračka <email@example.com>
Signed-off-by: Chris Wilson <firstname.lastname@example.org>