affect many files, and it is impossible for the developer who does
the
change to be sure in all cases that he has done the right thing.
In the case of "next-line -> forward-line" it is quite possible to
be sure:
just think hard about what the function should do in the presence of
invisible text or images, check at which the column the function may
terminate, check if it may be desired to add newlines at EOB, ...
In the case of org-mode the presence of `invisible' in the code is
a good
indication that there's a good chance that the change is unsafe.
that has happened sometimes: I get an email with proposed
changes, with
the request to check them before they are committed. For example,
Stefan
has been doing things like this, and I appreciate his comments and
additions, and the way he handles it, a lot.
Actually I often can't be bothered to wait, so I install the change
and then
send an email about it