[XembedSNIProxy] If available, always use 32-bit color.
Summary:
If available, always use 32-bit color. We don't need Composite extension to handle transparency - all client windows are our children and transparency in handled in QML, inside the panel (so no need to composite real windows).
BUG: 356937
FIXED-IN: 5.17.1
Test Plan:
Disable compositor, run:
- pidgin (make sure pidgin-libnotify is NOT installed)
- keepassx
- xchat
- liferea
Before changes: black backgroud
After changes: transparent background
Reviewers: davidedmundson, Plasma: Workspaces, Plasma
Reviewed By: davidedmundson, Plasma: Workspaces, Plasma
Subscribers: mlaurent, plasma-devel
Tags: Plasma
Differential Revision: https://phabricator.kde.org/D24530