bug#18944: 24.4; perl-mode electric-indent inside here documents

[Lars Ingebrigtsen]

Ed Avis <eda@waniasset.com> writes:

> With 26.1 the way to reproduce is a bit different.  Make a new buffer,
> M-x perl-mode, and enter
>
> my $x = <<END
> END
>
> hitting Return at the end of each line.  But when you hit Return on
> the second line, the END becomes indented by four spaces.  That's not
> right since a here-document terminator should be at the left margin.

This is apparently fixed in Emacs 29, but another related bug has
appeared:

my $x = <<END
END

If you hit RET after the second line, Emacs will then indent the next
line:

I.e., indented by four chars.

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