[Webkit-unassigned] [Bug 156988] New: [GTK] Overlay scrollbars with steppers enabled render incorrectly

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=156988

            Bug ID: 156988
           Summary: [GTK] Overlay scrollbars with steppers enabled render
                    incorrectly
    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 277265
  --> https://bugs.webkit.org/attachment.cgi?id=277265&action=review
Incorrect on-hover scrollbar using the Zukitre theme

When hovering with the mouse over a scrollbar in Epiphany (or any other application
which uses WebKitGTK+) with certain themes the scrollbar will get thicker than in
normal (non-hovered) state. This happens both with vertical and horizontal scrollbars,
and also with scrollbars nested in an <iframe> or in an HTML element which has
“overflow: scroll” in its CSS rules.

First I thought that this was an issue with the Zukitre theme, but the author
of the theme noticed that setting “-GtkScrollbar-has-backward-stepper” and
“-GtkScrollbar-has-forward-stepper” to “true” seems to cause this issue in
any theme. More info: https://github.com/lassekongo83/zuki-themes/issues/62

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