### 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
undo_redo->add_do_method(animation.ptr(), "track_set_key_transition", track, key, val);
				undo_redo->add_undo_method(animation.ptr(), "track_set_key_transition", track, key, prev_val);
				update_obj = true;
			}
			EditorUndoRedoManager *undo_redo = EditorUndoRedoManager::get_singleton();
			switch (animation->track_get_type(track)) {
				case Animation::TYPE_POSITION_3D:
				case Animation::TYPE_ROTATION_3D:
				case Animation::TYPE_SCALE_3D: {
					Variant old = animation->track_get_key_value(track, key);
					if (!setting) {
						String chan;
						switch (animation->track_get_type(track)) {
							case Animation::TYPE_POSITION_3D:
								chan = "Position3D";
								break;
							case Animation::TYPE_ROTATION_3D:
								chan = "Rotation3D";
								break;
							case Animation::TYPE_SCALE_3D:
								chan = "Scale3D";
								break;
							default: {
							}
						}
						setting = true;
						undo_redo->create_action(vformat(TTR("Animation Multi 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);