completion: Invoke the command being completed
As suggested by Ville Skyttä in !4012 (comment 2084405), make sure to invoke the copy of the command which is being completed when asking for completions of a given subcommand.
This avoids accidentally invoking any old gdbus
/gresource
/etc.
binary which is hanging around in another part of $PATH
.
Signed-off-by: Philip Withnall pwithnall@gnome.org