Index: Insert.cpp
===================================================================
--- Insert.cpp	(revision 12312)
+++ Insert.cpp	(working copy)
@@ -199,4 +199,11 @@
 	OnlineSearchMenu(bar);
 	bar.MenuSeparator();
 	editor.StdBar(bar);
+	
+	bar.Add(editor.IsSelection() && IsClipboardAvailableText(), "Diff", [=]() {
+		DiffDlg dlg;
+		dlg.diff.left.RemoveFrame(dlg.p);
+		dlg.diff.Set(ReadClipboardText(), editor.GetSelection());
+		dlg.Run();
+	});
 }