[Webkit-unassigned] [Bug 145513] New: Scrollbars render with glitches using GTK themes that do not define a background for them

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=145513

            Bug ID: 145513
           Summary: Scrollbars render with glitches using GTK themes that
                    do not define a background for them
    Classification: Unclassified
           Product: WebKit
           Version: 528+ (Nightly build)
          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

Created attachment 254001
  --> https://bugs.webkit.org/attachment.cgi?id=254001&action=review
Screenshot

With GTK+ themes where the background of the scrollbar is set to transparent,
the scrollbar painting does not seem to be blended with the web view as
background, and the scrollbar marker is just painted over and over, without
ever clearing the background.

Reported downstream for the MosSky theme here:

   https://github.com/dasnoopy/moslight-themes/issues/14

The theme author commented:

> it seems to be something related with webkitgtk and the new overlay scrollbars
> introduced with gtk+ 3.16. As workaround I'll set a white background for
> scrollbars.

Probably there is something that should be done in the WebKitGTK+ side to have
the transparent background in scrollbars render properly blended over the web
content.

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