bug#29664: 26.0.90; Auto Hscroll Mode + Visual Line Mode + Truncate don't work well together

[Lars Ingebrigtsen]

Eli Zaretskii <eliz@gnu.org> writes:

>> So at least with the default value of auto-hscroll-mode, a user is
>> not stuck wondering why C-a/C-e stopped
>> working, even if they enabled visual-line-mode and
>> toggle-truncate-lines simultaneously by mistake.
>
> If someone wants to propose a patch to warn the user in this case, I
> don't object.

`visual-line-mode' disables `truncate-lines', so for symmetry, I think
`toggle-truncate-lines' can disable `visual-line-mode' (and say that
it's doing so).  So I've done that on the trunk now.

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