### 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 (animation != p_anim) {
		return;
	}
	_clear_selection();
}
void AnimationTrackEditor::_select_at_anim(const Ref<Animation> &p_anim, int p_track, float p_pos) {
	if (animation != p_anim) {
		return;
	}
	int idx = animation->track_find_key(p_track, p_pos, Animation::FIND_MODE_APPROX);
	ERR_FAIL_COND(idx < 0);
	SelectedKey sk;
	sk.track = p_track;
	sk.key = idx;
	KeyInfo ki;
	ki.pos = p_pos;
	selection.insert(sk, ki);
	_update_key_edit();
}
void AnimationTrackEditor::_move_selection_commit() {