getAll
Gets a list of all of the applications currently registered on this system.
For desktop files, this includes applications that have NoDisplay=true set or are excluded from display by means of OnlyShowIn or NotShowIn. See method@Gio.AppInfo.should_show.
The returned list does not include applications which have the Hidden key set.
Return
a newly allocated list of references to iface@Gio.AppInfos.