Fixes p-e-w#381.

src/Autocompletion.vala

@@ -45,6 +45,8 @@ public class Autocompletion : Object {
 
 		tree_view.set_filter_function<AutocompletionEntry>(filter_function);
 		tree_view.set_sort_function<AutocompletionEntry>(sort_function);
+
+		tree_view.item_activated.connect((item) => item_activated(((AutocompletionEntry)item).text));
 	}
 
 	public void save_entries_to_file(string filename) {
@@ -191,6 +193,8 @@ public class Autocompletion : Object {
 		return popup_window.visible;
 	}
 
+	public signal void item_activated(string item);
+
 	private class AutocompletionEntry : Object {
 
 		public string text { get; set; }

src/FinalTerm.vala

@@ -117,6 +117,8 @@ public class FinalTerm : Gtk.Application {
 		string autocompletion_filename = data_dir.get_path() + "/commands.ftcompletion";
 
 		autocompletion = new Autocompletion();
+		autocompletion.item_activated.connect((command) =>
+			active_terminal_widget.set_shell_command(command));
 
 		if (File.new_for_path(autocompletion_filename).query_exists())
 			autocompletion.load_entries_from_file(autocompletion_filename);

src/ScrollableTreeView.vala

@@ -59,6 +59,14 @@ public class ScrollableTreeView<T> : ScrolledWindow {
 		filter = new TreeModelFilter (model, null);
 		list = new TreeView.with_model (filter);
 		list.headers_visible = false;
+		list.activate_on_single_click = true;
+		list.row_activated.connect ((path, column) => {
+			TreeIter iter;
+			Object val;
+			filter.get_iter (out iter, path);
+			filter.get(iter, 0, out val, -1);
+			item_activated(val);
+		});
 		add (list);
 		list.insert_column_with_attributes (0, "Command", view, "data", 0);
 
@@ -160,4 +168,6 @@ public class ScrollableTreeView<T> : ScrolledWindow {
 
 		return val;
 	}
+
+	public signal void item_activated (T item);
 }