Fix handling of '\\' inside double-quotes in Eshell

Previously, Eshell would get confused and think the following command
was unterminated due to the second double-quote looking like it was
escaped:

  echo "\\"

* lisp/eshell/esh-util.el (eshell-find-delimiter): Correct docstring
and treat '\' as an escapeable character when using backslash escapes.

* test/lisp/eshell/eshell-tests.el
(eshell-test/escape-special-quoted): Adapt test.

1 files changed, 2 insertions, 2 deletions

diff --git a/test/lisp/eshell/eshell-tests.el b/test/lisp/eshell/eshell-tests.el
index 1e303f70e5f..bcc2dc320b2 100644
--- a/test/lisp/eshell/eshell-tests.el
+++ b/test/lisp/eshell/eshell-tests.el
@@ -148,9 +148,9 @@ chars"
   "Test that the backslash is not preserved for escaped special
 chars"
   (with-temp-eshell
-   (eshell-command-result-p "echo \"h\\\\i\""
+   (eshell-command-result-p "echo \"\\\"hi\\\\\""
                             ;; Backslashes are doubled for regexp.
-                            "h\\\\i\n")))
+                            "\\\"hi\\\\\n")))
 
 (ert-deftest eshell-test/command-running-p ()
   "Modeline should show no command running"