### 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
break;
			}
			_anim_duplicate_keys(false);
		} break;
		case EDIT_DUPLICATE_TRANSPOSED: {
			if (bezier_edit->is_visible()) {
				EditorNode::get_singleton()->show_warning(TTR("This option does not work for Bezier editing, as it's only a single track."));
				break;
			}
			_anim_duplicate_keys(true);
		} break;
		case EDIT_ADD_RESET_KEY: {
			EditorUndoRedoManager *undo_redo = EditorUndoRedoManager::get_singleton();
			undo_redo->create_action(TTR("Animation Add RESET Keys"));
			Ref<Animation> reset = _create_and_get_reset_animation();
			int reset_tracks = reset->get_track_count();
			HashSet<int> tracks_added;
			for (const KeyValue<SelectedKey, KeyInfo> &E : selection) {
				const SelectedKey &sk = E.key;
				
				if (tracks_added.has(sk.track)) {
					continue;
				}
				tracks_added.insert(sk.track);
				int dst_track = -1;
				const NodePath &path = animation->track_get_path(sk.track);
				for (int i = 0; i < reset->get_track_count(); i++) {
					if (reset->track_get_path(i) == path) {
						dst_track = i;
						break;