### 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
update_obj = 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, base_map[track]);
						}
						if (!setting) {
							setting = true;
							undo_redo->create_action(TTR("Animation Multi 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);
						undo_redo->add_undo_method(animation.ptr(), "track_set_key_value", track, key, prev);
						update_obj = true;
					}
				} break;
				case Animation::TYPE_METHOD: {
					Dictionary d_old = animation->track_get_key_value(track, key);
					Dictionary d_new = d_old.duplicate();
					bool mergeable = false;
					if (name == "name") {
						d_new["method"] = p_value;
					} else if (name == "arg_count") {
						Vector<Variant> args = d_old["args"];
						args.resize(p_value);
						d_new["args"] = args;
						change_notify_deserved = true;