[Webkit-unassigned] [Bug 150557] [GTK] If two adjacent sides for the <fieldset> element have EXACTLY the same color defined

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=150557

Carlos Garcia Campos <cgarcia at igalia.com> changed:

           What    |Removed                     |Added
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                 CC|                            |alex at igalia.com

--- Comment #5 from Carlos Garcia Campos <cgarcia at igalia.com> ---
When rendering the border, if the bottom and left edges have the same style, GraphicsContext::clipConvexPolygon() is called with antialiased = false. This is why it only happens when two adjacent side share the color. The problem seems to be a cairo bug when antialias is set to NONE. It seems it generates the wrong clip polygon. Not changing the cairo antialias in GraphicsContext::clipConvexPolygon() fixes the issue.

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