Don't scroll down on event notifications

(when user manually scrolled up).

Updates #352

converse.js

@@ -1420,8 +1420,11 @@
                 if (!keep_old) {
                     this.clearStatusNotification();
                 }
+                var was_at_bottom = this.$content.scrollTop() + this.$content.innerHeight() >= this.$content[0].scrollHeight;
                 this.$content.append($('<div class="chat-info chat-event"></div>').text(message));
-                this.scrollDown();
+                if (was_at_bottom) {
+                    this.scrollDown();
+                }
             },
 
             clearChatRoomMessages: function (ev) {

docs/CHANGES.md

@@ -2,6 +2,8 @@
 
 ## 0.10.1 (Unreleased)
 
+- #352 When the user has manually scrolled up in a chat window, don't scroll
+  down on chat event notifications. [jcbrand]
 - #524 Added `auto_join_on_invite` parameter for automatically joining chatrooms. [ben]
 - #521 Not sending presence when connecting after disconnection. [jcbrand]
 - #536 Presence not sent out (in cases where it should) after page refresh. [jcbrand]