### 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
case Animation::TYPE_ROTATION_3D:
						chan = "Rotation3D";
						break;
					case Animation::TYPE_SCALE_3D:
						chan = "Scale3D";
						break;
					default: {
					}
				}
				undo_redo->create_action(vformat(TTR("Animation Change %s"), chan));
				undo_redo->add_do_method(animation.ptr(), "track_set_key_value", track, key, p_value);
				undo_redo->add_undo_method(animation.ptr(), "track_set_key_value", track, key, old);
				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;
		case Animation::TYPE_BLEND_SHAPE:
		case Animation::TYPE_VALUE: {
			if (name == "value") {
				Variant value = p_value;
				if (value.get_type() == Variant::NODE_PATH) {
					_fix_node_path(value);
				}
				setting = true;
				undo_redo->create_action(TTR("Animation Change Keyframe Value"), UndoRedo::MERGE_ENDS);
				Variant prev = animation->track_get_key_value(track, key);
				undo_redo->add_do_method(animation.ptr(), "track_set_key_value", track, key, value);