Corrected problems with the view window Print Item

Every time the "view" link on a "print queue item" is clicked a new
window would open. I made changes so that it only opens once regardless
of how many times it is clicked on.

MainSlidePanel.cs

@@ -1,5 +1,5 @@
-<<<<<<< HEAD
-=======
+//<<<<<<< HEAD
+//=======
 /*
 Copyright (c) 2014, Lars Brubaker
 All rights reserved.
@@ -29,7 +29,7 @@ of the authors and should not be interpreted as representing official policies,
 either expressed or implied, of the FreeBSD Project.
 */
 
->>>>>>> upstream/development
+//>>>>>>> upstream/development
 using System;
 using System.Collections.Generic;
 using System.Linq;

PrintLibrary/ExportLibraryItemWindow.cs

@@ -9,11 +9,11 @@ using MatterHackers.Agg.UI;
 using MatterHackers.MatterControl.DataStorage;
 using MatterHackers.MatterControl.PrintQueue;
 using MatterHackers.GCodeVisualizer;
-<<<<<<< HEAD
+//<<<<<<< HEAD
 using MatterHackers.Localizations;
-=======
+//=======
 using MatterHackers.MatterControl.SlicerConfiguration;
->>>>>>> upstream/development
+//>>>>>>> upstream/development
 
 namespace MatterHackers.MatterControl.PrintLibrary
 {

PrintLibrary/ExportLibraryItemWindow.cs.rej

@@ -0,0 +1,13 @@
+diff a/PrintLibrary/ExportLibraryItemWindow.cs b/PrintLibrary/ExportLibraryItemWindow.cs	(rejected hunks)
+@@ -9,7 +9,11 @@
+ using MatterHackers.MatterControl.DataStorage;
+ using MatterHackers.MatterControl.PrintQueue;
+ using MatterHackers.GCodeVisualizer;
++<<<<<<< HEAD
+ using MatterHackers.Localizations;
++=======
++using MatterHackers.MatterControl.SlicerConfiguration;
++>>>>>>> upstream/development
+ 
+ namespace MatterHackers.MatterControl.PrintLibrary
+ {

PrintQueue/PrintQueueItem.cs

@@ -33,7 +33,9 @@ namespace MatterHackers.MatterControl.PrintQueue
         FlowLayoutWidget editControls;
         LinkButtonFactory linkButtonFactory = new LinkButtonFactory();
 		ExportQueueItemWindow exportingWindow;
+		PartPreviewMainWindow viewingWindow;
 		bool exportingWindowIsOpen = false;
+		bool viewWindowIsOpen = false;
 
 
         public PrintQueueItem(PrintItemWrapper printItem)
@@ -140,7 +142,28 @@ namespace MatterHackers.MatterControl.PrintQueue
 			this.exportingWindowIsOpen = false;
 		}
 
-		
+		private void OpenViewWindow()
+		{
+			if (viewWindowIsOpen == false)
+			{
+				viewingWindow = new PartPreviewMainWindow(PrintItemWrapper);
+				this.viewWindowIsOpen = true;
+				viewingWindow.Closed += new EventHandler(PartPreviewWindow_Closed);
+			}
+			else
+			{
+				if(viewingWindow != null) 
+				{
+					viewingWindow.BringToFront();
+				}
+			}
+		}
+
+		void PartPreviewWindow_Closed(object sender, EventArgs e)
+		{
+			this.viewWindowIsOpen = false;
+		}
+
         private void CreateEditControls()
         {
             editControls = new FlowLayoutWidget();
@@ -156,10 +179,11 @@ namespace MatterHackers.MatterControl.PrintQueue
 					Button viewLink = linkButtonFactory.Generate(new LocalizedString("View").Translated);
                     viewLink.Click += (sender, e) =>
                     {
+
                         string pathAndFile = PrintItemWrapper.FileLocation;
                         if (File.Exists(pathAndFile))
                         {
-                            new PartPreviewMainWindow(PrintItemWrapper);
+							OpenViewWindow();
                         }
                         else
                         {