### 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
if (animation->track_get_type(dst_track) != animation->track_get_type(sk.track)) {
				continue;
			}
			int existing_idx = animation->track_find_key(dst_track, dst_time, Animation::FIND_MODE_APPROX);
			undo_redo->add_do_method(animation.ptr(), "track_insert_key", dst_track, dst_time, animation->track_get_key_value(E->key().track, E->key().key), animation->track_get_key_transition(E->key().track, E->key().key));
			undo_redo->add_undo_method(animation.ptr(), "track_remove_key_at_time", dst_track, dst_time);
			Pair<int, float> p;
			p.first = dst_track;
			p.second = dst_time;
			new_selection_values.push_back(p);
			if (existing_idx != -1) {
				undo_redo->add_undo_method(animation.ptr(), "track_insert_key", dst_track, dst_time, animation->track_get_key_value(dst_track, existing_idx), animation->track_get_key_transition(dst_track, existing_idx));
			}
		}
		undo_redo->add_do_method(this, "_clear_selection_for_anim", animation);
		undo_redo->add_undo_method(this, "_clear_selection_for_anim", animation);
		
		RBMap<SelectedKey, KeyInfo> new_selection;
		for (const Pair<int, float> &E : new_selection_values) {
			undo_redo->add_do_method(this, "_select_at_anim", animation, E.first, E.second);
		}
		for (RBMap<SelectedKey, KeyInfo>::Element *E = selection.back(); E; E = E->prev()) {
			undo_redo->add_undo_method(this, "_select_at_anim", animation, E->key().track, E->get().pos);
		}
		undo_redo->add_do_method(this, "_redraw_tracks");
		undo_redo->add_undo_method(this, "_redraw_tracks");
		undo_redo->commit_action();
	}
}
void AnimationTrackEditor::_edit_menu_about_to_popup() {