Add back X-KDE-ParentApp entries in metadata.desktop

Authored by bshah on Jun 25 2019, 10:34 AM.

Description

Add back X-KDE-ParentApp entries in metadata.desktop

Issue with notifications applet not appearing is fixed in
plasma-framework now

This reverts commit c21c63fe71ad0691c0ec22bd7d3ec726d623ea20.