Test comment-multi-line = nil auto fill case too

* test/lisp/progmodes/js-tests.el (js-mode-auto-fill): Test with
`comment-multi-line' both nil and non-nil.
* lisp/newcomment.el (comment-multi-line): Mark safe if it's a
boolean.
* etc/NEWS: Mention that `js-mode' now sets `comment-multi-line'.

1 files changed, 3 insertions, 0 deletions

diff --git a/etc/NEWS b/etc/NEWS
index 31b05ddbab4..421e5daa3e4 100644
--- a/etc/NEWS
+++ b/etc/NEWS
@@ -624,6 +624,9 @@ initialization files.
 ---
 ** 'auto-revert-use-notify' is set back to t in 'global-auto-revert-mode'.
 
+---
+** JS mode now sets 'comment-multi-line' to t.
+
 ** CSS mode
 
 ---