bug#62536: 30.0.50; Can we add """ ... """ electric pair in elixir, just like python

[Wilhelm Kirschbaum]

> > On Tue, Apr 4, 2023 at 7:12 PM Wilhelm Kirschbaum
> > <wkirschbaum@gmail.com> wrote:
> >
> > > The custom psif is not for the newline, but for pairing up the
> > > triple
> > > quotes `"""` with another set of tripe quotes when
> > > electric-pair-mode is
> > > enabled.  The newline is for keeping the syntax valid in 
> > > elixir,
> > > otherwise the font and navigation breaks because `""""""` is 
> > > not
> > > valid
> > > Elixir syntax and the tree-sitter grammar really does not like 
> > > it.
> >
> > I see.  My apologies for not having noticed this in the 
> > preceding
> > emails.  If you want some kind of electricity so that typing 
> > the
> > third `"` results in two `"` and a newline getting added, then
> > that is completely new and probably does require a custom psif.


Just to clarify on the desired behaviour:

With `|` is (point):

When typing the first quote `"|` it pairs to be `"|"` as single 
quote
strings are valid in Elixir.  Then when typing the second `"` it 
skips
the second quote `""|`, now when typing the third quote `""|"` it 
pairs
the heredoc: `"""|"""` and with electric-layout it will now insert 
the
newlines: `"""\n|\n"""`.

This means, as the original report, the user can type

`@doc """|` and will correctly jump into the heredoc and 
tree-sitter
grammar will stay valid.

@doc """
|
"""

There is no scenario in Elixir I can thin of where this is not the
desired behaviour.