Remove Text: prefix and item duplications from clipboard ring

src/AddIns/DisplayBindings/AvalonEdit.AddIn/Src/ContextActions/ClipboardRing.cs

@@ -0,0 +1,22 @@
+/*
+ * Created by SharpDevelop.
+ * User: hp
+ * Date: 2013-12-22
+ * Time: 16:09
+ * 
+ * To change this template use Tools | Options | Coding | Edit Standard Headers.
+ */
+using System;
+
+namespace ICSharpCode.AvalonEdit.AddIn.ContextActions
+{
+	/// <summary>
+	/// Description of ClipboardRing.
+	/// </summary>
+	public class ClipboardRing
+	{
+		public ClipboardRing()
+		{
+		}
+	}
+}

src/Main/Base/Project/Src/Gui/Components/SideBar/TextEditorSideBar.cs

@@ -84,7 +84,9 @@ namespace ICSharpCode.SharpDevelop.Gui
 				string shortenedText = text.Trim();
 				if (shortenedText.Length > 50)
 					shortenedText = shortenedText.Substring(0, 47) + "...";
-				clipboardRing.Items.Add("Text:" + shortenedText, text);
+				
+				RemoveFromClipboardRing(text);
+				clipboardRing.Items.Add(shortenedText, text);
 				if (clipboardRing.Items.Count > 20) {
 					clipboardRing.Items.RemoveAt(0);
 				}
@@ -92,6 +94,21 @@ namespace ICSharpCode.SharpDevelop.Gui
 			Refresh();
 		}
 		
+		void RemoveFromClipboardRing(string text) 
+		{
+			int pos = 0;
+			foreach (var item in clipboardRing.Items) {
+				string itemData = item.Tag as string;
+				if(itemData != null && itemData.Equals(text))
+					break;
+				pos++;
+			}
+				
+			if (pos < clipboardRing.Items.Count) {
+				clipboardRing.Items.RemoveAt(pos);
+			}
+		}
+		
 		public void SaveSideBarViewConfig()
 		{
 			XmlDocument doc = new XmlDocument();