[Webkit-unassigned] [Bug 237732] New: [css-grid] Grid contents sometimes layout with the wrong width

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=237732

            Bug ID: 237732
           Summary: [css-grid] Grid contents sometimes layout with the
                    wrong width
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: Unspecified
               URL: https://www.economist.com/the-economist-explains/2022/
                    02/03/how-apples-privacy-push-cost-meta-10bn
                OS: Unspecified
            Status: NEW
          Keywords: InRadar
          Severity: Normal
          Priority: P2
         Component: Layout and Rendering
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: mattwoodrow at apple.com
                CC: bfulgham at webkit.org, simon.fraser at apple.com,
                    webkit-bug-importer at group.apple.com, zalan at apple.com

<rdar://88512506>

Resizing the browser on the provided URL sometimes lays out the main article text to the wrong width, where it doesn't line wrap at all and just extends off the right side of the page.

It looks like we call RenderGrid::computeIntrinsicLogicalWidths and that results in us calling layoutIfNeeded on the child RenderBlock with an estimated width (which turns out to be wrong).

Now that we've mutated the child and laid it out incorrectly, nothing marks the RenderGrid itself as needing layout, so we never do a proper layout with the final grid column sizes to fix this again.

The bug happens intermittently, since anytime we do a full layout of the grid, we also layout the children correctly.

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