### 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
key_ofs = p_key_ofs;
	use_fps = p_use_fps;
	set_label("Time");
	spinner = memnew(EditorSpinSlider);
	spinner->set_focus_mode(Control::FOCUS_CLICK);
	spinner->set_min(0);
	spinner->set_allow_greater(true);
	spinner->set_allow_lesser(true);
	if (use_fps) {
		spinner->set_step(1);
		spinner->set_hide_slider(true);
		real_t fps = animation->get_step();
		if (fps > 0) {
			fps = 1.0 / fps;
		}
		spinner->set_value(key_ofs * fps);
	} else {
		spinner->set_step(0.0001);
		spinner->set_value(key_ofs);
		spinner->set_max(animation->get_length());
	}
	add_child(spinner);
	spinner->connect("grabbed", callable_mp(this, &AnimationTrackKeyEditEditor::_time_edit_entered), CONNECT_DEFERRED);
	spinner->connect("ungrabbed", callable_mp(this, &AnimationTrackKeyEditEditor::_time_edit_exited), CONNECT_DEFERRED);
	spinner->connect("value_focus_entered", callable_mp(this, &AnimationTrackKeyEditEditor::_time_edit_entered), CONNECT_DEFERRED);
	spinner->connect("value_focus_exited", callable_mp(this, &AnimationTrackKeyEditEditor::_time_edit_exited), CONNECT_DEFERRED);
}
AnimationTrackKeyEditEditor::~AnimationTrackKeyEditEditor() {
}