[Webkit-unassigned] [Bug 230541] New: [GTK] Allow sending precise mouse wheel events in LayoutTests

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=230541

            Bug ID: 230541
           Summary: [GTK] Allow sending precise mouse wheel events in
                    LayoutTests
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Tools / Tests
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: clord at igalia.com
            Blocks: 229037

Currently in TestRunner you can send a mouse wheel event with start/end phases, but you can't actually send pixel or sub-pixel precise mouse-wheel events. This is a bit of a pain for GTK specifically because kinetic scrolling can only be exercised with precise mouse-wheel events. This is actually the same for other platforms that use sync scrolling and the base scroll animation classes, but I suspect GTK is the main consumer here (and the only one I can easily test).

We may well want this behaviour on other non-Mac/iOS platforms, such as WPE, but I'm dealing with GTK first as it's the easiest to test.


Referenced Bugs:

https://bugs.webkit.org/show_bug.cgi?id=229037
[Bug 229037] [GTK] CSS scroll snapping interacts badly with smooth scrolling (sync scrolling)
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