### 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
setting = false;
				return true;
			}
			if (name == "out_handle") {
				const Variant &value = p_value;
				setting = true;
				undo_redo->create_action(TTR("Animation Change Keyframe Value"), UndoRedo::MERGE_ENDS);
				Vector2 prev = animation->bezier_track_get_key_out_handle(track, key);
				undo_redo->add_do_method(animation.ptr(), "bezier_track_set_key_out_handle", track, key, value);
				undo_redo->add_undo_method(animation.ptr(), "bezier_track_set_key_out_handle", track, key, prev);
				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;
			}
			if (name == "handle_mode") {
				const Variant &value = p_value;
				setting = true;
				undo_redo->create_action(TTR("Animation Change Keyframe Value"), UndoRedo::MERGE_ENDS);
				int prev = animation->bezier_track_get_key_handle_mode(track, key);
				undo_redo->add_do_method(this, "_bezier_track_set_key_handle_mode", animation.ptr(), track, key, value);
				undo_redo->add_undo_method(this, "_bezier_track_set_key_handle_mode", animation.ptr(), track, key, prev);
				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;
			}
		} break;