[Webkit-unassigned] [Bug 242513] Animation doesn't play with grid and position absolute (bad grid repaint)

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=242513

--- Comment #7 from Oriol Brufau <obrufau at igalia.com> ---
Created attachment 462362

  --> https://bugs.webkit.org/attachment.cgi?id=462362&action=review

test case 2

This isn't really related to CSS animations, same problem when changing the width with JS.

The problem seems to be that, if the width shrinks from e.g. 100px to 90px, then these 10px need to be repainted. However, if the 1st column is 1px wide, only 10-1=9 pixels will be repainted, the other pixel stays red.

In the original testcase these non-repainted areas touch each other, so it seems the animation is not playing at all. But in this new testcase it's clearer what's happening.

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