[Webkit-unassigned] [Bug 227604] New: `flex-basis` behaves unexpectedly with children using `max-height: fit-content; `

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=227604

            Bug ID: 227604
           Summary: `flex-basis` behaves unexpectedly with children using
                    `max-height: fit-content;`
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Layout and Rendering
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: pangle at apple.com
                CC: bfulgham at webkit.org, simon.fraser at apple.com,
                    svillar at igalia.com, zalan at apple.com

Created attachment 432754

  --> https://bugs.webkit.org/attachment.cgi?id=432754&action=review

Screen Recording of Issue

Applying a flex-basis of 100% to a children of a flex container behaves as expected when first applied, but if a media query causes that style to "go away" and come back, the results are different than when the 100% was initially applied. See attached video and reproduction page.

Steps to reproduce:
1. Open the attached reproduction page.
2. Size the window to just taller than 600px (you should see four stacked colorful divs)
3. Check the box to change the flex-basis to `100%` from `inherit`.
4. Reduce the window height until the colorful boxes become boring text.
5. Resize the window back to taller than 600px.
6. Observe that only the yellow div is visible, the others are all 0px tall now, despite having the same style applied as when we started resizing the window.

Reproduces on ToT WebKit. I can not reproduce this prior to r279271, but that issue may simply have been masking this problem.

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