bug#25030: 25.1; Unexpected indentation and syntax-highlighting in `emacs-lisp-mode'

[Andy Moreton <andrewjmoreton@gmail.com>]

On Sun 27 Nov 2016, Philipp Stephani wrote:

> Klaus-Dieter Bauer <bauer.klaus.dieter@gmail.com> schrieb am Sa., 26. Nov.
> 2016 um 00:13 Uhr:
>
>> Hello!
>>
>> In `emacs-lisp-mode', the counting of the nesting level of forms seems
>> to be broken in some subtle way. Consider e.g.
>>
>>     (form
>>      (
>>       ) WEIRD HIGHLIGHT
>>         x) ;; Unexepected Indentation
>>
>> It looks like "WEIRD HIGHLIGHT" is wrongly highlighted as junk after a
>> surplus closing parenthesis, and the subsequent form is also weirdly
>> indented.
>>
>>
> This is working as intended (i.e. not a bug). Lisp-mode explicitly tests
> for this. When you hover over the highlighted part, you get a tooltip
> "Hidden behind deeper element; move to another line?"
> While not a syntax error, there's such a strong convention to avoid such
> formatting that the Lisp modes warn unconditionally about it.

This may not be a bug, but it is certainly a mis-feature.

Warning should be reserved for syntax which may have unintended or
surprising semantics. Indentation that does not follow a convention is
not wrong either systacically or semantically.

Please remove this broken mis-feature.

    AndyM