### 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
return play_position_pos;
}
void AnimationTimelineEdit::update_play_position() {
	play_position->queue_redraw();
}
void AnimationTimelineEdit::update_values() {
	if (!animation.is_valid() || editing) {
		return;
	}
	editing = true;
	if (use_fps && animation->get_step() > 0) {
		length->set_value(animation->get_length() / animation->get_step());
		length->set_step(1);
		length->set_tooltip_text(TTR("Animation length (frames)"));
		time_icon->set_tooltip_text(TTR("Animation length (frames)"));
		if (track_edit) {
			track_edit->editor->_update_key_edit();
		}
	} else {
		length->set_value(animation->get_length());
		length->set_step(0.0001);
		length->set_tooltip_text(TTR("Animation length (seconds)"));
		time_icon->set_tooltip_text(TTR("Animation length (seconds)"));
	}
	switch (animation->get_loop_mode()) {
		case Animation::LOOP_NONE: {
			loop->set_icon(get_editor_theme_icon(SNAME("Loop")));
			loop->set_pressed(false);
		} break;