[banshee] Fixed notification area popup position on multi-monitor systems (bgo#537696)

[Alexander Kojevnikov <alexk src gnome org>]

commit 889125e300d05923713e5fbf5078a160150a9246
Author: Alexander Kojevnikov <alexander kojevnikov com>
Date:   Fri May 15 11:38:13 2009 +1000

    Fixed notification area popup position on multi-monitor systems (bgo#537696)
---
 .../X11NotificationAreaBox.cs                      |    8 ++++++--
 1 files changed, 6 insertions(+), 2 deletions(-)

diff --git a/src/Extensions/Banshee.NotificationArea/Banshee.NotificationArea/X11NotificationAreaBox.cs b/src/Extensions/Banshee.NotificationArea/Banshee.NotificationArea/X11NotificationAreaBox.cs
index 7cc52cf..275e1df 100644
--- a/src/Extensions/Banshee.NotificationArea/Banshee.NotificationArea/X11NotificationAreaBox.cs
+++ b/src/Extensions/Banshee.NotificationArea/Banshee.NotificationArea/X11NotificationAreaBox.cs
@@ -230,8 +230,12 @@ namespace Banshee.NotificationArea
             PositionWidget (popup, out x, out y, 5);
             
             x = x - (popup_req.Width / 2) + (event_box_req.Width / 2);     
-            if (x + popup_req.Width >= event_box.Screen.Width) { 
-                x = event_box.Screen.Width - popup_req.Width - 5;
+
+            int monitor = event_box.Screen.GetMonitorAtPoint (x, y);
+            int monitor_width = event_box.Screen.GetMonitorGeometry(monitor).Width;
+
+            if (x + popup_req.Width >= monitor_width) {
+                x = monitor_width - popup_req.Width - 5;
             } else if (x < 5) {
                 x = 5;
             }