### 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 (!root->has_node(animation->track_get_path(insert_key_from_track_call_track))) {
		EditorNode::get_singleton()->show_warning(TTR("Track path is invalid, so can't add a method key."));
		return;
	}
	Node *base = root->get_node(animation->track_get_path(insert_key_from_track_call_track));
	List<MethodInfo> minfo;
	base->get_method_list(&minfo);
	for (const MethodInfo &E : minfo) {
		if (E.name == p_method) {
			Dictionary d;
			d["method"] = p_method;
			Array params;
			int first_defarg = E.arguments.size() - E.default_arguments.size();
			for (int i = 0; i < E.arguments.size(); i++) {
				if (i >= first_defarg) {
					Variant arg = E.default_arguments[i - first_defarg];
					params.push_back(arg);
				} else {
					Callable::CallError ce;
					Variant arg;
					Variant::construct(E.arguments[i].type, arg, nullptr, 0, ce);