bug#23492: 24.5; JS spread operator breaks indentatiton

[Dmitry Gutov <dgutov@yandex.ru>]

On 05/09/2016 05:50 AM, Sam DeSota wrote:
>
> Using the ES spread operator at the begining of a line causes the
> indentation level to go up, as if it were a chained property access.
>
> ```
> {
>   test: true,
>     ...spread // Indentation should be back one
> }
> ```

Thanks for the report.

Eli, do you think this will be okay to fix in emacs-25?

The patch is below:

diff --git a/lisp/progmodes/js.el b/lisp/progmodes/js.el
index 48eb3e7..f024d39 100644
--- a/lisp/progmodes/js.el
+++ b/lisp/progmodes/js.el
@@ -1744,7 +1744,7 @@ js--declaration-keyword-re
    "Regular expression matching variable declaration keywords.")

  (defconst js--indent-operator-re
-  (concat "[-+*/%<>&^|?:.]\\([^-+*/]\\|$\\)\\|!?=\\|"
+  (concat "[-+*/%<>&^|?:.]\\([^-+*/.]\\|$\\)\\|!?=\\|"
            (js--regexp-opt-symbol '("in" "instanceof")))
    "Regexp matching operators that affect indentation of continued 
expressions.")

diff --git a/test/indent/js.js b/test/indent/js.js
index 23fae17..b40d47b 100644
--- a/test/indent/js.js
+++ b/test/indent/js.js
@@ -103,6 +103,12 @@ Foobar
      console.log(num);
    });

+var z = [
+  ...iterableObj,
+  4,
+  5
+]
+
  var arr = [
    -1, 2,
    -3, 4 +