[Webkit-unassigned] [Bug 225764] New: [GTK] Wrong smooth animation sometimes with non-async scrolling

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=225764

            Bug ID: 225764
           Summary: [GTK] Wrong smooth animation sometimes with non-async
                    scrolling
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Keywords: Gtk
          Severity: Normal
          Priority: P2
         Component: WebKitGTK
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: cgarcia at igalia.com
                CC: bugs-noreply at webkitgtk.org

This is easy to reproduce with epiphany, opening the browser with a several of tabs. Then go tab by tab scrolling and some of them don't scroll properly, the smooth animation is wrong. This is happening because sometimes when the scrollbars are added to the scroll view, the contents size hasn't been updated yet, so that values saved by ScrollAnimationSmooth::updateVisibleLengths() are 0x0. After that the updateVisibleLengths() is not called again when the contents size is updated, so scroll happens with the wrong visible lengths. This doesn't happen with async scrolling because updateVisibleLengths()  is called every time layers are repositioned. For non-async scrolling it should be enough to update visible lengths when he contents size changes.

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