### 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
} else if (name.begins_with("args/")) {
						Vector<Variant> args = d_old["args"];
						int idx = name.get_slice("/", 1).to_int();
						ERR_FAIL_INDEX_V(idx, args.size(), false);
						String what = name.get_slice("/", 2);
						if (what == "type") {
							Variant::Type t = Variant::Type(int(p_value));
							if (t != args[idx].get_type()) {
								Callable::CallError err;
								if (Variant::can_convert_strict(args[idx].get_type(), t)) {
									Variant old = args[idx];
									Variant *ptrs[1] = { &old };
									Variant::construct(t, args.write[idx], (const Variant **)ptrs, 1, err);
								} else {
									Variant::construct(t, args.write[idx], nullptr, 0, err);
								}
								change_notify_deserved = true;
								d_new["args"] = args;
							}
						} else if (what == "value") {
							Variant value = p_value;
							if (value.get_type() == Variant::NODE_PATH) {
								_fix_node_path(value, base_map[track]);
							}
							args.write[idx] = value;
							d_new["args"] = args;
							mergeable = true;
						}
					}
					Variant prev = animation->track_get_key_value(track, key);