### 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 (mm.is_valid() && box_selecting) {
		if (!mm->get_button_mask().has_flag(MouseButtonMask::LEFT)) {
			
			box_selection->hide();
			box_selecting = false;
			return;
		}
		if (!box_selection->is_visible_in_tree()) {
			if (!mm->is_command_or_control_pressed() && !mm->is_shift_pressed()) {
				_clear_selection(true);
			}
			box_selection->show();
		}
		Vector2 from = box_selecting_from;
		Vector2 to = scroll->get_global_transform().xform(mm->get_position());
		if (from.x > to.x) {
			SWAP(from.x, to.x);
		}
		if (from.y > to.y) {
			SWAP(from.y, to.y);
		}
		Rect2 rect(from, to - from);
		Rect2 scroll_rect = Rect2(scroll->get_global_position(), scroll->get_size());
		rect = scroll_rect.intersection(rect);
		box_selection->set_position(rect.position);
		box_selection->set_size(rect.size);
		box_select_rect = rect;
	}
}
void AnimationTrackEditor::_toggle_bezier_edit() {