[gnome-shell] Don't show the summary if a new item got removed before we had a chance to show it

[Marina Zhurakhinskaya <marinaz src gnome org>]

commit b017a2187bc69e8d775d8f2cb71268742965228b
Author: Marina Zhurakhinskaya <marinaz redhat com>
Date:   Thu Sep 30 17:02:16 2010 -0400

    Don't show the summary if a new item got removed before we had a chance to show it
    
    It's possible that an item that was added to the summary got removed before
    we had a chance to show the summary because the user has interacted with
    the notification (e.g. clicked on an application ready notification). We should
    not be showing the summary with an unchanged set of items in this case.
    
    However, it is possible that multiple items were added to the summary before
    we had a chance to show the summary, and only some of them got removed. In view
    of this scenario, we can't just use a boolean flag to indicate if the summary
    needs to be shown, but have to maintain an array of new summary items instead.
    
    https://bugzilla.gnome.org/show_bug.cgi?id=630939

 js/ui/messageTray.js |   17 +++++++++++++----
 1 files changed, 13 insertions(+), 4 deletions(-)
---
diff --git a/js/ui/messageTray.js b/js/ui/messageTray.js
index 7bdf2f4..aa65a15 100644
--- a/js/ui/messageTray.js
+++ b/js/ui/messageTray.js
@@ -917,6 +917,11 @@ MessageTray.prototype = {
             }));
 
         this._summaryItems = [];
+        // We keep a list of new summary items that were added to the summary since the last
+        // time it was shown to the user. We automatically show the summary to the user if there
+        // are items in this list once the notifications are done showing or once an item gets
+        // added to the summary without a notification being shown.
+        this._newSummaryItems = [];
         this._longestSummaryItem = null;
     },
 
@@ -955,7 +960,6 @@ MessageTray.prototype = {
         let summaryItem = new SummaryItem(source, minTitleWidth);
 
         this._summary.insert_actor(summaryItem.actor, 0);
-        this._summaryNeedsToBeShown = true;
 
         let newItemTitleWidth = summaryItem.getTitleNaturalWidth();
         if (newItemTitleWidth > minTitleWidth) {
@@ -967,6 +971,7 @@ MessageTray.prototype = {
         }
 
         this._summaryItems.push(summaryItem);
+        this._newSummaryItems.push(summaryItem);
 
         source.connect('notify', Lang.bind(this, this._onNotify));
 
@@ -1007,6 +1012,10 @@ MessageTray.prototype = {
 
         this._summary.remove_actor(this._summaryItems[index].actor);
 
+        let newSummaryItemsIndex = this._newSummaryItems.indexOf(this._summaryItems[index]);
+        if (newSummaryItemsIndex != -1)
+            this._newSummaryItems.splice(newSummaryItemsIndex, 1);
+
         this._summaryItems.splice(index, 1);
         if (this._longestSummaryItem.source == source) {
 
@@ -1214,7 +1223,7 @@ MessageTray.prototype = {
         let notificationsDone = !notificationsVisible && !notificationsPending;
 
         if (this._summaryState == State.HIDDEN) {
-            if (notificationsDone && this._summaryNeedsToBeShown)
+            if (notificationsDone && this._newSummaryItems.length > 0)
                 this._showSummary(true);
             else if (summarySummoned)
                 this._showSummary(false);
@@ -1438,7 +1447,7 @@ MessageTray.prototype = {
     },
 
     _showSummaryCompleted: function(withTimeout) {
-        this._summaryNeedsToBeShown = false;
+        this._newSummaryItems = [];
 
         if (withTimeout) {
             this._summaryTimeoutId =
@@ -1459,7 +1468,7 @@ MessageTray.prototype = {
                       time: ANIMATION_TIME,
                       transition: 'easeOutQuad'
                     });
-        this._summaryNeedsToBeShown = false;
+        this._newSummaryItems = [];
     },
 
     _showSummaryNotification: function() {