Clear timestamp timeouts if the window closes

// FREEBIE

js/chromium.js

@@ -122,6 +122,10 @@
                 window.addEventListener('beforeunload', callback);
             }
         },
+        onClosed: function(callback) {
+            // assumes only one front end window
+            return chrome.app.window.getAll()[0].onClosed.addListener(callback);
+        },
 
         drawAttention: function(window_id) {
             if (chrome.app.window) {

js/views/timestamp_view.js

@@ -6,8 +6,11 @@
     window.Whisper = window.Whisper || {};
 
     Whisper.MessageTimestampView = Whisper.View.extend({
+        initialize: function() {
+            extension.windows.onClosed(this.clearTimeout.bind(this));
+        },
         update: function() {
-            clearTimeout(this.timeout);
+            this.clearTimeout();
             var millis_now = Date.now();
             var millis = this.$el.data('timestamp');
             if (millis >= millis_now) {
@@ -48,6 +51,9 @@
                 if (delay < 0) { delay = 0; }
                 this.timeout = setTimeout(this.update.bind(this), delay);
             }
+        },
+        clearTimeout: function() {
+            clearTimeout(this.timeout);
         }
     });
 })();