[Webkit-unassigned] [Bug 224424] New: Element retains dimensions after its children are removed, children are not rendered anymore

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=224424

            Bug ID: 224424
           Summary: Element retains dimensions after its children are
                    removed, children are not rendered anymore
           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: tomc at caurea.org
                CC: bfulgham at webkit.org, simon.fraser at apple.com,
                    zalan at apple.com

I have a horizontally scrollable list of cards, and a toggle button which removes/adds the cards from the container. When the cards are removed, the container becomes an div with no children. On Safari, clicking the button to remove the cards removes the children, but the container retains its original dimensions. Furthermore, the label from the button disappears (possibly a completely unrelated bug).

A repro case is here: https://vvugb.csb.app. Click the button and observe how the container doesn't shrink vertically. The <hr> is placed after the container, so it should move up, but doesn't. Clicking the button again to show the cards doesn't work anymore, the cards are inserted into the DOM but not rendered.

You can see the code here: https://codesandbox.io/s/peaceful-morning-vvugb?file=/src/App.tsx.

A couple notes:

 - If I remove overflowX:auto from the container, the bug disappears.
 - If I remove the card with the longest name ({ name: "Excepteur sint occaecat cupidatat non proident" }), the bug disappears (possibly bug is present whenever the text wraps to multiple lines?)
 - Resizing the viewport fixes the bug temporarily (I guess because it triggers a layout/render of the whole viewport).

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