bug#20846: 24.4; Electric-indent-mode does not call indent-line-function after hitting RET inside a comment

[Eli Zaretskii]

> From: Stefan Monnier <monnier@iro.umontreal.ca>
> Cc: Dmitry Gutov <dgutov@yandex.ru>,  larsi@gnus.org,
>   robin.neatherway@gmail.com,  20846@debbugs.gnu.org
> Date: Fri, 28 May 2021 10:09:41 -0400
> 
> > Then that sentence is misleading and should be rephrased, because my
> > reading of it is that it clearly states that auto-indentation inside
> > strings is generally impossible, and expects the implementations to
> > behave like that.
> 
> [ It does not say intend to that.  It says to return `noindent` when
>   indentation is impossible and gives "inside a string" as an example of
>   a reason why indentation might not be possible.  ]

Then how about saying the below instead?

  If it is called somewhere where it cannot auto-indent, the function
  should return `noindent' to signal that it didn't.

(I intentionally removed the example because I think it isn't really
needed, and is actually harmful in this case.)