[Webkit-unassigned] [Bug 261295] New: REGRESSION (UI-side compositing) Disabled scrollbars don't show in some cases

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=261295

            Bug ID: 261295
           Summary: REGRESSION (UI-side compositing) Disabled scrollbars
                    don't show in some cases
           Product: WebKit
           Version: Safari 16
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Scrolling
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: simon.fraser at apple.com
                CC: simon.fraser at apple.com

Created attachment 467591

  --> https://bugs.webkit.org/attachment.cgi?id=467591&action=review

Test case

The attached test case shows that we fail to render disabled scrollbars. To reproduce, turn on always-on scrollbars in system preferences, then load the test case.

The test has overflow:scroll, which should always render the scrollbars, but because the content is not scrollable, they should appear disabled.

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