Expand the compose box in the correct mode when narrowed to PMs.

(imported from commit 68e4bb3091b855dafda8df3ca10737abb5d2f337)

zephyr/static/js/compose.js

@@ -555,7 +555,11 @@ $(function () {
     $("#new_message_content").click(function (e) {
         // If we click in the composebox, start up a new message
         if (!compose.composing()) {
+            if (narrow.narrowed_to_pms()) {
+                compose.set_mode('private');
+            } else {
                 compose.set_mode('stream');
+            }
             e.stopPropagation();
         }
     });

zephyr/static/js/narrow.js

@@ -603,6 +603,19 @@ exports.by_stream_subject_uri = function (stream, subject) {
            "/subject/" + hashchange.encodeHashComponent(subject);
 };
 
+exports.narrowed_to_pms = function () {
+    // Are we narrowed to PMs: all PMs or PMs with particular people.
+    var operators = narrow.operators();
+    if (!operators) {
+        return false;
+    }
+    if ((operators[0][0] === "pm-with") ||
+        ((operators[0][0] === "is") && (operators[0][1] === "private-message"))) {
+        return true;
+    }
+    return false;
+};
+
 return exports;
 
 }());