[Webkit-unassigned] [Bug 258539] New: Flex widths do not correctly recalculate on hover

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=258539

            Bug ID: 258539
           Summary: Flex widths do not correctly recalculate on hover
           Product: WebKit
           Version: Safari 16
          Hardware: Mac (Apple Silicon)
                OS: macOS 13
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Layout and Rendering
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: constance.chen at elastic.co
                CC: bfulgham at webkit.org, simon.fraser at apple.com,
                    zalan at apple.com

Created attachment 466829

  --> https://bugs.webkit.org/attachment.cgi?id=466829&action=review

Gif of the issue on hover, and then a gif of what the behavior should be on focus

This *specifically* affects the `:hover` pseudo state and *not* the `:focus` pseudo state.

- The widths affected are both `width` and `flex-basis` properties, neither seem to matter for the purposes of this bug.
- Both `animation` and `transition` are affected by this bug as well as when no animation/transition is present

Here is a minimum reproducible Codepen of the issue: https://codepen.io/Cee-Chen/pen/PoxWeZa

On Firefox and Chrome/Edge, on hover, the text within `.shrinkingContent` is correctly pushed/shifted to the left (its flex width accounts for the sibling that gains a width on hover).

In Safari (latest 16.5), the text within `.shrinkingContent` does *not* update correctly and instead of shifting to the left, it gets overlaid by the new sibling. The reason this is a rendering issue is because if you do anything to force a refresh/rerender (e.g. double clicking where the text should be, adding an animation to `.shrinkingContent`), the view updates to what the expected layout should be.

Also, per the first line, if you focus the wrapper via tab keypress instead of hovering, this rendering issue does not occur whatsoever.

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