[Webkit-unassigned] [Bug 115699] Round when converting percentage length to LayoutUnit

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=115699

Ryan Reno <rreno at apple.com> changed:

           What    |Removed                     |Added
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                 CC|                            |rreno at apple.com

--- Comment #2 from Ryan Reno <rreno at apple.com> ---
Directly merging this as-is causes test regressions in

imported/w3c/web-platform-tests/css/css-flexbox/flex-lines/multi-line-wrap-with-column-reverse.html
imported/w3c/web-platform-tests/css/css-flexbox/flex-lines/multi-line-wrap-reverse-with-column-reverse.html

As the window shrinks the 3-1 flex item which should be on the right edge of the viewport begins to strobe between wrapping into a fourth flex line and staying on the line it is expected to be on.

The rounding behavior is interacting in a strange way with flex wrap computation. Since we're currently passing these tests and they're targets for interop 2022 (by virtue of being in interop 2021) it's risky to do this change when there aren't any other progressions beyond those progressions already landed.

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