### 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
subindices.push_back(":y");
			subindices.push_back(":z");
		} break;
		case Variant::QUATERNION: {
			subindices.push_back(":x");
			subindices.push_back(":y");
			subindices.push_back(":z");
			subindices.push_back(":w");
		} break;
		case Variant::COLOR: {
			subindices.push_back(":r");
			subindices.push_back(":g");
			subindices.push_back(":b");
			subindices.push_back(":a");
		} break;
		case Variant::PLANE: {
			subindices.push_back(":x");
			subindices.push_back(":y");
			subindices.push_back(":z");
			subindices.push_back(":d");
		} break;
		default: {
			if (r_valid) {
				*r_valid = false;
			}
		}
	}
	return subindices;
}
AnimationTrackEditor::TrackIndices AnimationTrackEditor::_confirm_insert(InsertData p_id, TrackIndices p_next_tracks, bool p_reset_wanted, Ref<Animation> p_reset_anim, bool p_create_beziers) {