### 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
to_v = a + fmod(2.0 * to_diff, Math_TAU) - to_diff;
						}
						Variant delta_v = Animation::subtract_variant(to_v, from_v);
						double duration = to_t - from_t;
						double fixed_duration = duration - UNIT_EPSILON; 
						for (double delta_t = dur_step; delta_t < fixed_duration; delta_t += dur_step) {
							Pair<real_t, Variant> keydata;
							keydata.first = from_t + delta_t;
							keydata.second = Tween::interpolate_variant(from_v, delta_v, delta_t, duration, transition_type, ease_type);
							insert_queue_new.append(keydata);
						}
					}
				}
				
				for (int i = 0; i < insert_queue_new.size(); i++) {
					undo_redo->add_do_method(animation.ptr(), "track_insert_key", track, insert_queue_new[i].first, insert_queue_new[i].second);
					undo_redo->add_undo_method(animation.ptr(), "track_remove_key_at_time", track, insert_queue_new[i].first);
				}
				++E;
			}
			undo_redo->add_do_method(this, "_clear_selection_for_anim", animation);
			undo_redo->add_undo_method(this, "_clear_selection_for_anim", animation);
			undo_redo->add_do_method(this, "_redraw_tracks");
			undo_redo->add_undo_method(this, "_redraw_tracks");
			undo_redo->commit_action();
			_update_key_edit();
		} break;
		case EDIT_DUPLICATE_SELECTION: {
			if (bezier_edit->is_visible()) {
				bezier_edit->duplicate_selection();