[Webkit-unassigned] [Bug 221067] New: Page scrolling by wheel events doesn't work in non-AC mode pages if async scrolling is enabled (WinCairo)

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=221067

            Bug ID: 221067
           Summary: Page scrolling by wheel events doesn't work in non-AC
                    mode pages if async scrolling is enabled (WinCairo)
           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: Hironori.Fujii at sony.com
                CC: simon.fraser at apple.com

Page scrolling by wheel events doesn't work in non-AC mode pages if async scrolling is enabled (WinCairo)

I'm trying to enable Async Scrolling for WinCairo. Attachment#418496 is the WIP patch.

1. Start MiniBrowser
2. Go to a non-AC mode page. For example, https://trac.webkit.org/wiki
   Or, disable Accelerated Compositing by using menu.
3. Rolling the wheel of the mouse
4. the page doesn't scroll as expected

Mac port is setting setForceCompositingMode(true).

There was a similar issue:
Bug 219547 – REGRESSION(r270425) [GTK] wheel scrolling stopped working

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