[Webkit-unassigned] [Bug 203132] New: Pinch to zoom gesture has to be repeated twice if the cursor isn't moved between gestures

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=203132

            Bug ID: 203132
           Summary: Pinch to zoom gesture has to be repeated twice if the
                    cursor isn't moved between gestures
           Product: WebKit
           Version: Safari 13
          Hardware: Macintosh
                OS: macOS 10.15
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: New Bugs
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: tym46383 at gmail.com

Pinching to zoom in Safari 13 (and 12) results in the gesture not being recognized unless the mouse cursor is moved between gestures. Instead, it has to be performed twice before the browser reacts.

This works correctly in the WebKit nightly (i.e. you can zoom without moving the mouse), so I'm wondering if it's related to the "tab overview" gesture, which is not in the nightly.

As an example, on any page:
1. Pinch out to zoom the page in.
2. Lift up your fingers but don't move the mouse cursor.
3. Do the same gesture again and observe that it doesn't work. The scrollbars appear but the page contents don't zoom.
4. Lift your fingers and do the gesture again. It will work this time.

This also applies to zooming out.

It doesn't work in Safari Technology Preview 94 either.

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