Fix js-mode indentation bug

Bug#15582:
* lisp/progmodes/js.el (js--find-newline-backward): New function.
(js--continued-expression-p): Use it.
* test/manual/indent/js.js: Add new test.

1 files changed, 6 insertions, 0 deletions

diff --git a/test/manual/indent/js.js b/test/manual/indent/js.js
index 806e9497ad5..d004b82f8bc 100644
--- a/test/manual/indent/js.js
+++ b/test/manual/indent/js.js
@@ -118,6 +118,12 @@ var arr = [
     -5
 ];
 
+// Regression test for bug#15582.
+if (x > 72 &&
+    y < 85) { // found
+  do_something();
+}
+
 // Local Variables:
 // indent-tabs-mode: nil
 // js-indent-level: 2