### 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
multi_key_edit->animation = animation;
		multi_key_edit->animation_read_only = read_only;
		RBMap<int, List<float>> key_ofs_map;
		RBMap<int, NodePath> base_map;
		int first_track = -1;
		for (const KeyValue<SelectedKey, KeyInfo> &E : selection) {
			int track = E.key.track;
			if (first_track < 0) {
				first_track = track;
			}
			if (!key_ofs_map.has(track)) {
				key_ofs_map[track] = List<float>();
				base_map[track] = NodePath();
			}
			int key_id = E.key.key;
			if (key_id >= animation->track_get_key_count(track)) {
				_clear_key_edit();
				return; 
			}
			key_ofs_map[track].push_back(animation->track_get_key_time(track, E.key.key));
		}
		multi_key_edit->key_ofs_map = key_ofs_map;
		multi_key_edit->base_map = base_map;
		multi_key_edit->hint = _find_hint_for_track(first_track, base_map[first_track]);
		multi_key_edit->use_fps = timeline->is_using_fps();
		multi_key_edit->root_path = root;
		EditorNode::get_singleton()->push_item(multi_key_edit);
	}
}
void AnimationTrackEditor::_clear_selection_for_anim(const Ref<Animation> &p_anim) {