Code review comment for lp:~andrea.corbellini/software-properties/fix-621977

The patch looks fine with one minor detail: lots of unchanged lines are added to the diff (probably because tab/spaces usage - whitespace differences). It would be nice if you could set up your editor to use spaces instead of tabs (I think software-properties uses spaces instead of tabs) to avoid harder-to-review diffs, because the reviewer has to filter the real changes.

Other than that: nice solution to comment the source line by default, but leave an option to enable the source with the same command.