[Libreoffice-bugs] [Bug 114485] New: Widgets have transparent background

[bugzilla-daemon at bugs.documentfoundation.org]

https://bugs.documentfoundation.org/show_bug.cgi?id=114485

            Bug ID: 114485
           Summary: Widgets have transparent background
           Product: LibreOffice
           Version: 5.4.3.2 release
          Hardware: All
                OS: All
            Status: UNCONFIRMED
          Severity: normal
          Priority: medium
         Component: graphics stack
          Assignee: libreoffice-bugs at lists.freedesktop.org
          Reporter: davidedmundson at kde.org

Created attachment 138458
  --> https://bugs.documentfoundation.org/attachment.cgi?id=138458&action=edit
Screenshot of the problem

Widgets rendered by the VCL toolkit don't have alpha on the backing store set
properly. The screenshot explains it best. 
We also have it in the grey area behind the white document in writer.

Problem exists in multiple window managers. Turning off WM compositing masks
the problem.

In libreoffice GL acceleration is off (and apitrace shows no calls)
VCL backend is GTK. Changing the VCL toolkit doesn't seem to make a difference.

It's fine on my main machine, this happens on a specific ARM64 laptop. Whereas
other apps (Qt4, Qt5, GTK2, GTK3) all work fine. I assume it's something quirky
with our X drivers that libreoffice isn't handling the same.

Happy to get any other information requested.

(reproducible with libreoffice 5.1 and 5.4)

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