Don't treat JS spread as contination method call

* lisp/progmodes/js.el (js--indent-operator-re):
Allow only one dot (bug#23492).

* test/indent/js.js (default): Add a corresponding example.

lisp/progmodes/js.el

@@ -1744,7 +1744,7 @@ This performs fontification according to `js--class-styles'."
   "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.")
 

test/indent/js.js

@@ -103,6 +103,12 @@ Foobar
     console.log(num);
   });
 
+var z = [
+  ...iterableObj,
+  4,
+  5
+]
+
 var arr = [
   -1, 2,
   -3, 4 +