This patch 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.
An option could be to add a Konfigurator flag to warn the user (possibly doubling the dialogs).
FIXED: [ 394938 ] Can't run .desktop files
BUG: 394938