.desktop files with NoDisplay=true can't be executed

[fulalas]

Steps to replicate:

1. as root, edit the file/usr/share/applications/com.system76.CosmicEdit.desktop
2. add in the last line NoDisplay=true and save
3. close all instances of cosmic-files
4. open cosmic-files and try to double click on any .txt file

Current behavior:

1. Nothing happens

Expected behavior:

1. the application (cosmic-edit) should open
2. the .desktop file should not appear in the applications menu (i.e. it's hidden but it should work!)

This works in all desktop environments I tested so far, including Xfce, Cinnamon, LXQt, LXDE, KDE and GNOME.

Also, cosmic-files needs to be restarted in order to get the changes made in the .desktop files, something that other file managers don't require (e.g Thunar). Not to mention there's no 'Open with...' when right clicking on .desktop files.