### 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 (!clicking_on_name) {
		return Variant();
	}
	Dictionary drag_data;
	drag_data["type"] = "animation_track";
	String base_path = animation->track_get_path(track);
	base_path = base_path.get_slice(":", 0); 
	drag_data["group"] = base_path;
	drag_data["index"] = track;
	Button *tb = memnew(Button);
	tb->set_flat(true);
	tb->set_text(path_cache);
	tb->set_icon(icon_cache);
	set_drag_preview(tb);
	clicking_on_name = false;
	return drag_data;
}
bool AnimationTrackEdit::can_drop_data(const Point2 &p_point, const Variant &p_data) const {