### 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 (panner->gui_input(p_event)) {
		scroll->accept_event();
		return;
	}
	Ref<InputEventMouseButton> mb = p_event;
	if (mb.is_valid() && mb->get_button_index() == MouseButton::LEFT) {
		if (mb->is_pressed()) {
			box_selecting = true;
			box_selecting_from = scroll->get_global_transform().xform(mb->get_position());
			box_select_rect = Rect2();
		} else if (box_selecting) {
			if (box_selection->is_visible_in_tree()) {
				
				for (int i = 0; i < track_edits.size(); i++) {
					Rect2 local_rect = box_select_rect;
					local_rect.position -= track_edits[i]->get_global_position();
					track_edits[i]->append_to_selection(local_rect, mb->is_command_or_control_pressed());
				}
				if (_get_track_selected() == -1 && track_edits.size() > 0) { 
					track_edits[track_edits.size() - 1]->grab_focus();
				}
			} else {
				_clear_selection(true); 
			}
			box_selection->hide();
			box_selecting = false;
		}
	}
	Ref<InputEventMouseMotion> mm = p_event;