Execute .desktop file
Allows the user to run .desktop instead of opening it in the external editor.
As a .desktop file could lead to security issues (evil Exec=), KIO will warn the user when he tries to launch it from an unknown location (see XDG_DATA_DIRS), setting the file with executable bit if the user confirms.
FIXED: [ 394938 ] Can't run .desktop files BUG: 394938
Moved from : https://phabricator.kde.org/D29430