[Webkit-unassigned] [Bug 168231] New: [GTK] Glitch rendering backgrounds after hovering elements in HiDPI

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=168231

            Bug ID: 168231
           Summary: [GTK] Glitch rendering backgrounds after hovering
                    elements in HiDPI
    Classification: Unclassified
           Product: WebKit
           Version: Other
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: WebKit Gtk
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: aperez at igalia.com
                CC: bugs-noreply at webkitgtk.org

Created attachment 301346
  --> https://bugs.webkit.org/attachment.cgi?id=301346&action=review
Screen capture demoing the issue (GIF, ~4 MiB)

In some websites, after hovering an element which changes the background, the original
background is not correctly restored when the element is not hovered anymore. Check the
attached GIF for a demo of how this looks when the issue is triggered by PhpReport
(https://github.com/Igalia/phpreport).

This happens both an AC and non-AC modes, but only in HiDPI: manually setting the
window scale factor to 1x in GNOME Tweak Tool makes the glitches go away.

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