(to mimick CI) : make uninstall in kpackage and then
QT_LOGGING_RULES='*=true' XDG_DATA_DIRS=$KDEDIR/share /d/kde/build/5/frameworks/kpackage/bin/kpackagetool5 --appstream-metainfo . --appstream-metainfo-output /tmp/a.xml
For some reason kpackagetool5 creates a KPluginMetaData from
metadata.desktop in 3 different places of the code
(Package::setPath calls metadata() but then it deletes it!, metadata() again later, and PackageTool::showAppstreamInfo)
Before: Unknown property type for key "X-Plasma-MainScript" -> falling back to string
After: No more warning