bug#59622: 29.0.50; [PATCH] Regression in Eshell's handling of escaped newlines

[Jim Porter]

Starting from "emacs -Q -f eshell":

  # Emacs 28
  ~ $ echo foo\
  bar

  foobar

  # Emacs 29
  ~ $ echo foo\
  bar

  foo
  bar

That is, Emacs 28 used to treat escaped newlines in the way you'd expect 
from other shells: it expands to the empty string. Now in Emacs 29, it 
inserts a literal newline.

There's also a similar bug when doing this inside double-quotes:

  # Emacs 28
  ~ $ echo "foo\
  bar"

  ("foo\\" "bar")

  # Emacs 29
  ~  $ echo "foo\
  bar"

  foo\
  bar

Here, both cases are wrong. In Emacs 29, it inserts the literal 
backslash+newline combo, but Emacs 28 is even worse: it returns a list 
of two elements! Wrapping arguments in quotes should always produce a 
string in Eshell.

0001-Treat-escaped-newlines-in-Eshell-as-the-empty-string.patch
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