From eb7fd1ba51a2572cbba53f5ea2397f479fd565c7 Mon Sep 17 00:00:00 2001
From: Zev Benjamin <zev@zulip.com>
Date: Wed, 30 Oct 2013 13:38:16 -0400
Subject: [PATCH] Add some front-end debugging changes

(imported from commit 21684b09100bc0a24372948a9417c973709c1be2)
---
 static/js/message_list.js | 4 ++++
 static/js/narrow.js       | 6 ++++++
 2 files changed, 10 insertions(+)

diff --git a/static/js/message_list.js b/static/js/message_list.js
index fd6d94ad49..67918af451 100644
--- a/static/js/message_list.js
+++ b/static/js/message_list.js
@@ -173,6 +173,10 @@ MessageList.prototype = {
                            {table_name: this.table_name, id: id});
         }
 
+        if (closest_id === -1) {
+            blueslip.fatal("Cannot select id -1", {table_name: this.table_name});
+        }
+
         id = closest_id;
         opts.id = id;
         this._selected_id = id;
diff --git a/static/js/narrow.js b/static/js/narrow.js
index 0b148146a0..975637e3c5 100644
--- a/static/js/narrow.js
+++ b/static/js/narrow.js
@@ -101,6 +101,11 @@ exports.activate = function (operators, opts) {
         return exports.deactivate();
     }
     var filter = new Filter(operators);
+    blueslip.debug("Narrowed", {operators: _.map(filter.operators(),
+                                                 function (e) { return e[0]; }),
+                                previous_id: current_msg_list.selected_id(),
+                                previous_is_summarized: current_msg_list.is_summarized_message(
+                                    current_msg_list.get(current_msg_list.selected_id()))});
 
     var had_message_content = compose.has_message_content();
 
@@ -313,6 +318,7 @@ exports.deactivate = function () {
     if (current_filter === undefined) {
         return;
     }
+    blueslip.debug("Unnarrowed");
 
     if (ui.actively_scrolling()) {
         // There is no way to intercept in-flight scroll events, and they will