Prompt the user for confirmation before removing an export preset

Requested by Radio SRB (http://srb.fm)

gtk2_ardour/export_preset_selector.cc

@@ -153,6 +153,18 @@ ExportPresetSelector::remove_current ()
 {
 	if (!profile_manager) { return; }
 
+	Gtk::MessageDialog dialog (_("Do you really want to remove this preset?"),
+			false,
+			Gtk::MESSAGE_QUESTION,
+			Gtk::BUTTONS_YES_NO);
+
+	if (Gtk::RESPONSE_YES != dialog.run ()) {
+		/* User has selected "no" or closed the dialog, better
+		 * abort
+		 */
+		return;
+	}
+
 	profile_manager->remove_preset();
 	entry.get_entry()->set_text ("");
 	sync_with_manager ();