bug#30946: 26.0.90; TRAMP cannot access some files when using hops

[Phil Sainty]

> Ad-hoc proxy definitions are removed by
> "M-x tramp-cleanup-all-connections".
> I've added a respective hint to the manual.

Right; but given that there is now some form of error detection in the
case when a clearly-incorrect hostname is given for the sudo/su methods,
would it not be very sensible to also ensure that a proxy matching the
incorrect hostname is not added?

As it is, the error is 'caught' but the unwanted behaviour silently
happens anyway, which seems bad to me; especially when any subsequent
use of that proxy is likely to be pretty confounding.  In the worst
case someone can end up unwittingly connecting to a different machine
than the one they intended, at which point they could inadvertently
cause themselves real problems.

Sure, it's ultimately their mistake; but when that mistake was actually
detected at the outset, it seems a shame not to deal with it then.


-Phil