### 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 (!p_item) {
		return;
	}
	NodePath np = p_item->get_metadata(0);
	Node *node = get_node(np);
	if (!p_filter.is_empty() && ((String)node->get_name()).findn(p_filter) != -1) {
		p_select_candidates.push_back(node);
	}
	TreeItem *c = p_item->get_first_child();
	while (c) {
		_pick_track_select_recursive(c, p_filter, p_select_candidates);
		c = c->get_next();
	}
}
void AnimationTrackEditor::_pick_track_filter_input(const Ref<InputEvent> &p_ie) {