some Combobox improvements in the Search pad (MRU ability, reverse order for saved terms)

git-svn-id: svn://svn.sharpdevelop.net/sharpdevelop/trunk@5917 1ccf3a8d-04fe-1044-b7c0-cef0b8235c61

src/AddIns/Misc/HelpViewer/Source/Controls/SearchPadControl.xaml.cs

@@ -37,7 +37,9 @@ namespace MSHelpSystem.Controls
 			if (string.IsNullOrEmpty(term)) {
 				throw new ArgumentNullException("term");
 			}
-			if (searchTerms.IndexOf(term) < 0) searchTerms.Add(term);
+			searchCB.Text = "";
+			if (searchTerms.IndexOf(term) < 0) searchTerms.Insert(0,term);
+			else searchTerms.Move(searchTerms.IndexOf(term), 0);
 			DisplayHelp.Search(term);
 		}
 	}