Clear the prefix selection buffer when changing location

After changing directory, the previously typed in prefix (for finding a selection) is cleared immediately without waiting for the timeout. This allows traversing known directory structures very quickly by typing in very few letters for each prefix and hitting enter in between.

src/app.rs

@@ -4179,6 +4179,8 @@ impl Application for App {
                             self.activate_nav_model_location(&tab_path);
 
                             self.tab_model.text_set(entity, tab_title);
+                            // clear the prefix selection buffer when changing location
+                            self.type_select_prefix.clear();
                             commands.push(Task::batch([
                                 self.update_title(),
                                 self.update_watcher(),