### 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_INDEX(p_track, animation->get_track_count());
	if (snap->is_pressed() && step->get_value() != 0) {
		p_ofs = snap_time(p_ofs);
	}
	while (animation->track_find_key(p_track, p_ofs, Animation::FIND_MODE_APPROX) != -1) { 
		p_ofs += 0.0001;
	}
	EditorUndoRedoManager *undo_redo = EditorUndoRedoManager::get_singleton();
	switch (animation->track_get_type(p_track)) {
		case Animation::TYPE_POSITION_3D: {
			if (!root->has_node(animation->track_get_path(p_track))) {
				EditorNode::get_singleton()->show_warning(TTR("Track path is invalid, so can't add a key."));
				return;
			}
			Node3D *base = Object::cast_to<Node3D>(root->get_node(animation->track_get_path(p_track)));
			if (!base) {
				EditorNode::get_singleton()->show_warning(TTR("Track is not of type Node3D, can't insert key"));
				return;
			}
			Vector3 pos = base->get_position();
			undo_redo->create_action(TTR("Add Position Key"));
			undo_redo->add_do_method(animation.ptr(), "position_track_insert_key", p_track, p_ofs, pos);
			undo_redo->add_undo_method(animation.ptr(), "track_remove_key_at_time", p_track, p_ofs);