### 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
InsertData id;
	id.path = np;
	
	id.query = vformat(TTR("node '%s'"), p_node->get_name());
	id.advance = false;
	id.track_idx = track_idx;
	id.value = p_value;
	id.type = p_type;
	_query_insert(id);
}
bool AnimationTrackEditor::has_track(Node3D *p_node, const String &p_sub, const Animation::TrackType p_type) {
	ERR_FAIL_COND_V(!root, false);
	if (!keying) {
		return false;
	}
	if (!animation.is_valid()) {
		return false;
	}
	
	String path = root->get_path_to(p_node, true);
	if (!p_sub.is_empty()) {
		path += ":" + p_sub;
	}
	int track_id = animation->find_track(path, p_type);
	if (track_id >= 0) {
		return true;
	}
	return false;
}
void AnimationTrackEditor::_insert_animation_key(NodePath p_path, const Variant &p_value) {