### 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
if (bezier_edit->is_visible()) {
		_cancel_bezier_edit();
	} else {
		int track_count = animation->get_track_count();
		for (int i = 0; i < track_count; ++i) {
			if (animation->track_get_type(i) == Animation::TrackType::TYPE_BEZIER) {
				_bezier_edit(i);
				return;
			}
		}
	}
}
void AnimationTrackEditor::_pan_callback(Vector2 p_scroll_vec, Ref<InputEvent> p_event) {
	Ref<InputEventWithModifiers> iewm = p_event;
	if (iewm.is_valid() && iewm->is_alt_pressed()) {
		if (p_scroll_vec.x < 0 || p_scroll_vec.y < 0) {
			goto_prev_step(true);
		} else {
			goto_next_step(true);
		}
	} else {
		timeline->set_value(timeline->get_value() - p_scroll_vec.x / timeline->get_zoom_scale());
		scroll->set_v_scroll(scroll->get_v_scroll() - p_scroll_vec.y);
	}
}
void AnimationTrackEditor::_zoom_callback(float p_zoom_factor, Vector2 p_origin, Ref<InputEvent> p_event) {