[gbrainy] Fix timer for slow systems

[Jordi Mas <jmas src gnome org>]

commit d92a40013ff8a2fc2c110d1a3b5fa8a2041a88de
Author: Jordi Mas <jmas softcatala org>
Date:   Sun Jun 12 20:08:45 2011 +0200

    Fix timer for slow systems

 src/Core/Main/Memory.cs |    4 ++++
 1 files changed, 4 insertions(+), 0 deletions(-)
---
diff --git a/src/Core/Main/Memory.cs b/src/Core/Main/Memory.cs
index ba7db50..8dd7335 100644
--- a/src/Core/Main/Memory.cs
+++ b/src/Core/Main/Memory.cs
@@ -122,6 +122,10 @@ namespace gbrainy.Core.Main
 
 		private void TimerUpdater (object source, ElapsedEventArgs e)
 		{
+			// In slow systems you can get pending events after the timer is disabled
+			if (timer.Enabled == false)
+				return;
+
 			if (shade == false && time_left == 0) {
 				lock (this) {
 					time_left = shading_time;