### 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
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);
		setting = true;
		EditorUndoRedoManager *undo_redo = EditorUndoRedoManager::get_singleton();
		undo_redo->create_action(TTR("Animation Change Transition"), UndoRedo::MERGE_ENDS);
		undo_redo->add_do_method(animation.ptr(), "track_set_key_transition", track, key, val);
		undo_redo->add_undo_method(animation.ptr(), "track_set_key_transition", track, key, prev_val);
		undo_redo->add_do_method(this, "_update_obj", animation);
		undo_redo->add_undo_method(this, "_update_obj", animation);
		undo_redo->commit_action();
		setting = false;
		return true;
	}
	EditorUndoRedoManager *undo_redo = EditorUndoRedoManager::get_singleton();
	switch (animation->track_get_type(track)) {
		case Animation::TYPE_POSITION_3D:
		case Animation::TYPE_ROTATION_3D:
		case Animation::TYPE_SCALE_3D: {
			if (name == "position" || name == "rotation" || name == "scale") {
				Variant old = animation->track_get_key_value(track, key);
				setting = true;
				String chan;
				switch (animation->track_get_type(track)) {
					case Animation::TYPE_POSITION_3D:
						chan = "Position3D";
						break;