### 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
bool update_obj = false;
	bool change_notify_deserved = false;
	for (const KeyValue<int, List<float>> &E : key_ofs_map) {
		int track = E.key;
		for (const float &key_ofs : E.value) {
			int key = animation->track_find_key(track, key_ofs, Animation::FIND_MODE_APPROX);
			ERR_FAIL_COND_V(key == -1, false);
			String name = p_name;
			if (name == "easing") {
				float val = p_value;
				float prev_val = animation->track_get_key_transition(track, key);
				EditorUndoRedoManager *undo_redo = EditorUndoRedoManager::get_singleton();
				if (!setting) {
					setting = true;
					undo_redo->create_action(TTR("Animation Multi Change Transition"), UndoRedo::MERGE_ENDS);
				}