Fix indentation before `!=' and after `+='

Originally reported in https://github.com/mooz/js2-mode/issues/174.
* lisp/progmodes/js.el (js--indent-operator-re): Make assignments and
(in)equality operator a separate case.
(js--continued-expression-p): Escape the second `+' in the regexp.

1 files changed, 8 insertions, 0 deletions

diff --git a/test/indent/js.js b/test/indent/js.js
index d623a0dc5bc..1924094e9d8 100644
--- a/test/indent/js.js
+++ b/test/indent/js.js
@@ -47,3 +47,11 @@ var p = {
 
 var evens = [e for each (e in range(0, 21))
                if (ed % 2 == 0)];
+
+!b
+  !=b
+  !==b
+
+a++
+b +=
+  c