Created attachment 158071 [details]
When using LibreOffice with the "gen" VCL Plugin (SAL_USE_VCLPLUGIN=gen) to disable theming, the new NotebookBar Interface looks broken (background not properly set).
Please see the screenshot.
I think it's already reported but I can't find it right now. Reproduced in
Build ID: e6b9bc3f2ecf0fb7fde5b02f9d750ccbe022f4c1
CPU threads: 4; OS: Linux 4.19; UI render: default; VCL: x11;
Locale: en-US (en_US.UTF-8); UI-Language: en-US