[Webkit-unassigned] [Bug 230953] [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

--- Comment #2 from Chris Lord <clord at igalia.com> ---
(In reply to Martin Robinson from comment #1)
> (In reply to Chris Lord from comment #0)
> > 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.
> 
> I think the keyboard scrolling is always done in the WebProcess, so that
> sort of makes sense.

I meant that after pressing space, then async scrolling works correctly - perhaps it's flipping some kind of flag somewhere or triggering some timer... I expect it's some kind of logic error with a flag, but I've not debugged it yet, I'm still just reading through the changes.

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