[Webkit-unassigned] [Bug 230953] New: [GTK][WPE] REGRESSION: Async scrolling jumps to the top of the page until keyboard-initiated paging

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=230953

            Bug ID: 230953
           Summary: [GTK][WPE] REGRESSION: Async scrolling jumps to the
                    top of the page until keyboard-initiated paging
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Scrolling
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: clord at igalia.com
                CC: simon.fraser at apple.com

Currently, async scrolling is broken on GTK/WPE (which, for WPE, means all scrolling is broken) - any scroll action snaps the page back to the top after appearing to 'try' to scroll. My best guess is the mechanism that synchronises main-thread scroll position with the async scroll tree's position is broken somehow. The odd thing is if you press space to scroll a page, scrolling then works correctly. This is almost certainly fall-out from https://bugs.webkit.org/show_bug.cgi?id=230739.

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