### 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 (dragging_hsize || hsize_rect.has_point(p_pos)) {
		
		return Control::CURSOR_HSIZE;
	} else {
		return get_default_cursor_shape();
	}
}
void AnimationTimelineEdit::_pan_callback(Vector2 p_scroll_vec, Ref<InputEvent> p_event) {
	set_value(get_value() - p_scroll_vec.x / get_zoom_scale());
}
void AnimationTimelineEdit::_zoom_callback(float p_zoom_factor, Vector2 p_origin, Ref<InputEvent> p_event) {
	double current_zoom_value = get_zoom()->get_value();
	get_zoom()->set_value(MAX(0.01, current_zoom_value * p_zoom_factor));
}
void AnimationTimelineEdit::set_use_fps(bool p_use_fps) {
	use_fps = p_use_fps;
	queue_redraw();
}
bool AnimationTimelineEdit::is_using_fps() const {
	return use_fps;
}
void AnimationTimelineEdit::set_hscroll(HScrollBar *p_hscroll) {