### Godot version

4.1.1

### System information

linux

### Issue description

- When favoriting a path in a `FileDialog`, clicking on it travels to `path/to/dir/`.
- When going up a level from there, it doesn't go to `path/to` but to `path/to/dir` (without the `/`).

[simplescreenrecorder-2023-08-18_09.38.37.webm](https://github.com/godotengine/godot/assets/71937306/00c20ad3-292f-4961-84ed-dbc64906df52)

The problem is either (or both) that:
 - loaded path has a trailing `/`
 - parent dir of `stuff/` is considered to be `stuff`

### Steps to reproduce

favorite a directory and use the feature to navigate to it

### Minimal reproduction project

any (i.e. the project manager's "new project" dialog has one)
return show_hidden_files;
}
void EditorFileDialog::set_default_show_hidden_files(bool p_show) {
	default_show_hidden_files = p_show;
}
void EditorFileDialog::set_default_display_mode(DisplayMode p_mode) {
	default_display_mode = p_mode;
}
void EditorFileDialog::_save_to_recent() {
	String cur_dir = get_current_dir();
	Vector<String> recent_new = EditorSettings::get_singleton()->get_recent_dirs();
	const int max = 20;
	int count = 0;
	bool res = cur_dir.begins_with("res://");
	for (int i = 0; i < recent_new.size(); i++) {
		bool cres = recent_new[i].begins_with("res://");
		if (recent_new[i] == cur_dir || (res == cres && count > max)) {
			recent_new.remove_at(i);
			i--;
		} else {
			count++;
		}
	}
	recent_new.insert(0, cur_dir);
	EditorSettings::get_singleton()->set_recent_dirs(recent_new);
}
void EditorFileDialog::set_disable_overwrite_warning(bool p_disable) {