### Godot version

4.2 dev3

### System information

Windows 10.0.19045 - Vulkan (Forward+) - dedicated NVIDIA GeForce GTX 1060 (NVIDIA; 30.0.15.1403) - Intel(R) Core(TM) i7-7700HQ CPU @ 2.80GHz (8 Threads)

### Issue description

If you have a Method Track with multiple calls to the same method, they are joined together and makes things unreadable:
![image](https://github.com/godotengine/godot/assets/2223172/a2ab8446-28a1-440b-b0d5-5049f5d705b4)
The horizontal line shouldn't be used here. I think it might be a regression.

### Steps to reproduce

1. Add AnimationPlayer
2. Add a Method Track (with Add Track button)
3. Add some key to the track
4. Add another key with the same method

### Minimal reproduction project

N/A
}
		for (int j = 0; j < p_animation->track_get_key_count(i); j++) {
			Variant v = p_animation->track_get_key_value(i, j);
			if (!Variant::can_convert(v.get_type(), valid_type)) {
				p_animation->track_remove_key(i, j);
				j--;
			}
		}
		if (p_animation->track_get_key_count(i) == 0 && cleanup_tracks->is_pressed()) {
			p_animation->remove_track(i);
			i--;
		}
	}
	EditorUndoRedoManager *undo_redo = EditorUndoRedoManager::get_singleton();
	undo_redo->clear_history(true, undo_redo->get_history_id_for_object(animation.ptr()));
	undo_redo->clear_history(true, undo_redo->get_history_id_for_object(this));
	_update_tracks();
}
void AnimationTrackEditor::_view_group_toggle() {
	_update_tracks();
	view_group->set_icon(get_editor_theme_icon(view_group->is_pressed() ? SNAME("AnimationTrackList") : SNAME("AnimationTrackGroup")));
	bezier_edit->set_filtered(selected_filter->is_pressed());
}
bool AnimationTrackEditor::is_grouping_tracks() {
	if (!view_group) {
		return false;
	}
	return !view_group->is_pressed();
}
void AnimationTrackEditor::_selection_changed() {