### 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
ERR_FAIL_COND(!root);
	
	Node *node = p_node;
	String path = root->get_path_to(node, true);
	if (Object::cast_to<AnimationPlayer>(node) && p_property == "current_animation") {
		if (node == AnimationPlayerEditor::get_singleton()->get_player()) {
			EditorNode::get_singleton()->show_warning(TTR("AnimationPlayer can't animate itself, only other players."));
			return;
		}
		_insert_animation_key(path, p_value);
		return;
	}
	EditorSelectionHistory *history = EditorNode::get_singleton()->get_editor_selection_history();
	for (int i = 1; i < history->get_path_size(); i++) {
		String prop = history->get_path_property(i);
		ERR_FAIL_COND(prop.is_empty());
		path += ":" + prop;
	}
	path += ":" + p_property;
	NodePath np = path;
	
	bool inserted = false;
	for (int i = 0; i < animation->get_track_count(); i++) {