### 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 EDIT_SCALE_FROM_CURSOR: {
			scale_dialog->popup_centered(Size2(200, 100) * EDSCALE);
		} break;
		case EDIT_SCALE_CONFIRM: {
			if (selection.is_empty()) {
				return;
			}
			float from_t = 1e20;
			float to_t = -1e20;
			float len = -1e20;
			float pivot = 0;
			for (const KeyValue<SelectedKey, KeyInfo> &E : selection) {
				float t = animation->track_get_key_time(E.key.track, E.key.key);
				if (t < from_t) {
					from_t = t;
				}
				if (t > to_t) {
					to_t = t;
				}
			}
			len = to_t - from_t;
			if (last_menu_track_opt == EDIT_SCALE_FROM_CURSOR) {
				pivot = timeline->get_play_position();
			} else {
				pivot = from_t;
			}
			float s = scale->get_value();
			ERR_FAIL_COND_MSG(s == 0, "Can't scale to 0.");
			EditorUndoRedoManager *undo_redo = EditorUndoRedoManager::get_singleton();
			undo_redo->create_action(TTR("Animation Scale Keys"));