[Webkit-unassigned] [Bug 253078] New: REGRESSION: Scroll gets stuck between snap-points when scrolling after overscroll

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=253078

            Bug ID: 253078
           Summary: REGRESSION: Scroll gets stuck between snap-points when
                    scrolling after overscroll
           Product: WebKit
           Version: Safari Technology Preview
          Hardware: Mac (Intel)
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Scrolling
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: augus.dupin at gmail.com
                CC: simon.fraser at apple.com

Created attachment 465219

  --> https://bugs.webkit.org/attachment.cgi?id=465219&action=review

testcase

In a scroll container with scroll-snap-type set to mandatory, when scrolling with the trackpad right after overscrolling and lifting the fingers in a way so no momentum occurs between two snap-points, the scroll gets stuck instead of snapping to the nearest snap-point.

Steps to reproduce:
- open the test case on macOS
- scroll down and then up in order to cause overscroll
- before the end of overscroll, scroll down without lifting the fingers
- lift your fingers, without causing momentum, between two snap-points

You should see the content get stuck between the snap-points instead of snapping to the nearest one.

This occurs in STP 164, but I don't know when it was introduced, except that it was after STP 146. I cannot test normal Safari 16 at the moment so I don't know if it is already affected.

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