[Webkit-unassigned] [Bug 227486] New: Pinch-zooming gets stuck sometimes

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=227486

            Bug ID: 227486
           Summary: Pinch-zooming gets stuck sometimes
           Product: WebKit
           Version: Safari Technology Preview
          Hardware: Mac (Apple Silicon)
                OS: Other
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Scrolling
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: tym46383 at gmail.com
                CC: simon.fraser at apple.com

When I pinch to zoom, it doesn't always work correctly. Sometimes, it doesn't work at all, sometimes it works as expected, and sometimes it gets stopped about halfway through zooming. It's hard to pinpoint what exactly triggers these different conditions. It happens on both zoom in and zoom out, but it's more common on zoom out.

It's a bit easier to trigger by zooming, moving your fingers elsewhere on the trackpad, and doing the opposite zooming gesture.

This is reminiscent of https://bugs.webkit.org/show_bug.cgi?id=203132 that I filed last year but it's slightly different.

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