List dialog should scroll to an initially selected item if necessary.

src/textadept_gtk.c

@@ -681,10 +681,9 @@ static int visible(GtkTreeModel *model, GtkTreeIter *iter, void *treeview) {
 static void select_nth_item(GtkTreeView *view, int n) {
 	GtkTreeSelection *selection = gtk_tree_view_get_selection(view);
 	if (gtk_tree_selection_count_selected_rows(selection) > 0) return; // already selected
-	GtkTreeIter iter;
-	if (!gtk_tree_model_get_iter_first(gtk_tree_view_get_model(view), &iter)) return;
-	for (int i = 1; i < n; i++) gtk_tree_model_iter_next(gtk_tree_view_get_model(view), &iter);
-	gtk_tree_selection_select_iter(selection, &iter);
+	GtkTreePath *path = gtk_tree_path_new_from_indices(n - 1, -1);
+	gtk_tree_selection_select_path(selection, path);
+	gtk_tree_view_scroll_to_cell(view, path, NULL, false, 0, 0);
 }
 
 // Signal for showing and hiding list values/rows depending on the current search key.

src/textadept_qt.cpp

@@ -498,12 +498,13 @@ int list_dialog(DialogOptions opts, lua_State *L) {
 				QString{text}.replace(QRegularExpression{"([^A-Za-z0-9_])"}, "\\\\1").replace("\\ ", ".*");
 			filter.setFilterRegularExpression(
 				QRegularExpression{re, QRegularExpression::CaseInsensitiveOption});
-			selection->select(
+			selection->setCurrentIndex(
 				filter.index(0, 0), QItemSelectionModel::Select | QItemSelectionModel::Rows);
 		});
 	if (opts.text) lineEdit->setText(opts.text);
-	selection->select(
-		filter.index(opts.select - 1, 0), QItemSelectionModel::Select | QItemSelectionModel::Rows);
+	auto index = filter.index(opts.select - 1, 0);
+	selection->setCurrentIndex(index, QItemSelectionModel::Select | QItemSelectionModel::Rows);
+	if (opts.select) QTimer::singleShot(0, [&treeView, index]() { treeView->scrollTo(index); });
 	lineEdit->installEventFilter(new KeyForwarder{treeView, &dialog});
 	auto buttonBox = new QDialogButtonBox;
 	int buttonClicked = 1; // ok/accept by default