[Webkit-unassigned] [Bug 217737] New: Twitter Photo gallery incorrectly rendered after opening another modal

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=217737

            Bug ID: 217737
           Summary: Twitter Photo gallery incorrectly rendered after
                    opening another modal
           Product: WebKit
           Version: Safari Technology Preview
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Layout and Rendering
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: charlie.croom at gmail.com
                CC: bfulgham at webkit.org, simon.fraser at apple.com,
                    zalan at apple.com

Created attachment 411385

  --> https://bugs.webkit.org/attachment.cgi?id=411385&action=review

Layout capture after bug; highlighted area is container of background-image

On twitter.com, we encountered a strange rendering bug when working on our photo gallery modal which causes the layout to incorrectly render when coming back to the gallery. 

Reproduce:
- Open this special link which removes our production workaround: . (Because this is an internal build, it's only available for 3 days at a time, but you can reach out to me to get a new one.)
- Go to a Tweet with a photo gallery: https://twitter.com/CharlieCroom/status/968880712286793728
- Open the gallery
- At the bottom is a reply icon, click it to open the composer
- Click the x in the top left of the composer to click it

Expected:
- Gallery renders normally

Actual:
- Gallery renders all messed up (see attachment)

To work around this in production, we've added `borderRadius: '0.01px'` to the dialog element. (It should have aria-modal="true")

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