### 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
String base = animation->get_path().substr(0, srpos);
			if (ResourceLoader::get_resource_type(base) == "PackedScene") {
				if (!get_tree()->get_edited_scene_root() || get_tree()->get_edited_scene_root()->get_scene_file_path() != base) {
					file_read_only = true;
				}
			} else {
				if (FileAccess::exists(base + ".import")) {
					file_read_only = true;
				}
			}
		}
	} else {
		if (FileAccess::exists(animation->get_path() + ".import")) {
			file_read_only = true;
		}
	}
	RBMap<String, VBoxContainer *> group_sort;
	bool use_grouping = !view_group->is_pressed();
	bool use_filter = selected_filter->is_pressed();
	for (int i = 0; i < animation->get_track_count(); i++) {
		AnimationTrackEdit *track_edit = nullptr;
		
		if (use_filter) {
			NodePath path = animation->track_get_path(i);
			if (root && root->has_node(path)) {
				Node *node = root->get_node(path);
				if (!node) {
					continue; 
				}
				if (!EditorNode::get_singleton()->get_editor_selection()->is_selected(node)) {