Make case search insensitive.

src/Main/Base/Project/Src/Gui/Dialogs/ReferenceDialog/ProjectReferencePanel.cs

@@ -92,11 +92,11 @@ namespace ICSharpCode.SharpDevelop.Gui
 				return true;
 			foreach(var token in tokens)
 			{
-				if(bigText.Contains(token))
+				if(bigText.IndexOf(token, StringComparison.OrdinalIgnoreCase)<0)
-					return true;
-			}
 					return false;
 			}
+			return true;
+		}
 		
 		void Search()
 		{