[Webkit-unassigned] [Bug 174449] New: Rocketchat "infinite scrollbar" corruption (visual artefacts)

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=174449

            Bug ID: 174449
           Summary: Rocketchat "infinite scrollbar" corruption (visual
                    artefacts)
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: All
                OS: Linux
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: WebKit Gtk
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: nekohayo at gmail.com
                CC: bugs-noreply at webkitgtk.org

Created attachment 315320

  --> https://bugs.webkit.org/attachment.cgi?id=315320&action=review

screencast

Pretty hard to explain into words, so see the attached screencast showing the scrollbar where some weird visual artefacts (blue horizontal lines) appear on top of rocketchat's* scrollbar everytime you scroll back up into the discussion (the infinite/elastic backlog scroll).

This does not happen on Firefox, only on Epiphany (which I use in "app" mode). Tried Epiphany 3.22-3.24, WebKitGTK4 2.16.5 from Fedora 26. The issue has been seen on other distros such as Debian testing, too.

*: There is a public demo instance that exists at https://demo.rocket.chat if you don't have it set up on your server.

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