Add Plasma's KCMS directory to the QT Plugin Path

[Douglas R. Reno]

As noted here:

​http://lists.linuxfromscratch.org/pipermail/blfs-dev/2019-June/036231.html

We need to add $KF5_PREFIX/lib/plugins/kcms to the QT_PLUGIN_PATH.

This will allow systemsettings5 to find plugins.

[Bruce Dubbs]

Milestone renamed

[Douglas R. Reno]

FTR, here's a way to reproduce this in the future:

1) Open KDE System Settings 2) Go to Desktop Effects 3) Check the logs

Aug 07 22:53:40 KANGA /usr/libexec/gdm-x-session[665]: KActivitiesStats( 0x1143cc0 ) ResultModelPrivate::onResultScoreUpdated  result added: "kcm:kwintabbox.desktop" score: 0 la>
Aug 07 22:54:09 KANGA /usr/libexec/gdm-x-session[665]: org.kde.kcoreaddons: Error loading plugin "kcm_workspace" "The shared library was not found."
Aug 07 22:54:09 KANGA /usr/libexec/gdm-x-session[665]: Plugin search paths are ("/opt/kf5/lib/plugins", "/opt/qt-5.13.0/plugins", "/opt/kf5/bin")
Aug 07 22:54:09 KANGA /usr/libexec/gdm-x-session[665]: The environment variable QT_PLUGIN_PATH might be not correctly set

These are in fact in /opt/kf5/lib/plugins/kcms:

renodr [ /opt/kf5/lib/plugins/kcms ]$ ls
kcm_cursortheme.so   kcm_energyinfo.so          kcm_fonts.so  kcm_kwin_virtualdesktops.so  kcm_lookandfeel.so  kcm_plymouth.so    kcm_splashscreen.so  kcm_workspace.so
kcm_desktoptheme.so  kcm_fileindexermonitor.so  kcm_icons.so  kcm_launchfeedback.so        kcm_nightcolor.so   kcm_pulseaudio.so  kcm_translations.so

For some reason, a large chunk of the system settings modules aren't inside of the normal plugin path. This'll get fixed by adding $KF5_PREFIX/lib/plugins/kcms to the QT_PLUGIN_PATH in /etc/profile.d/kf5.sh (for /opt configurations only)

[Douglas R. Reno]

Fixed at r21919