[Webkit-unassigned] [Bug 258491] New: Flaky background-position test and on window resize fail

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=258491

            Bug ID: 258491
           Summary: Flaky background-position test and on window resize
                    fail
           Product: WebKit
           Version: Safari Technology Preview
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: CSS
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: ahmad.saleem792 at gmail.com

Hi Team,

While going through some Blink merge, I noticed that my patch affected below three tests, while investigating, I noticed that we 'PASS' them but upon checking, noticed that if we resize the browser, it start showing 'red' strip, which means, we fail later on resize.

https://wpt.fyi/results/css/css-writing-modes?label=master&label=experimental&aligned&q=background-position-vrl-0

Live Test Line (Sample): http://wpt.live/css/css-writing-modes/background-position-vrl-020.xht

^ Open this in Safari Technology Preview 172 and resize browser window, we will now have 'red' strip.

__________

I did this patch here:

Link: https://github.com/WebKit/WebKit/blob/d5918187d18a309512bf04da9a709f43762634a0/Source/WebCore/rendering/BackgroundPainter.cpp#L554

LayoutRect extendedBackgroundRect = view.frameView().extendedBackgroundRectForPainting();
+                if (renderer.style().writingMode() == WritingMode::RightToLeft)
+                   left = borderBoxRect.width() - positioningAreaSize.width() - right - renderer.marginRight();
+               else

__________

Blink Commit: https://src.chromium.org/viewvc/blink?view=revision&revision=194132

________

Just wanted to raise, so we can track these failures.

Thanks!

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