### 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
if (selection.size() && animation.is_valid() && (!transpose || (_get_track_selected() >= 0 && _get_track_selected() < animation->get_track_count()))) {
		int top_track = 0x7FFFFFFF;
		float top_time = 1e10;
		for (RBMap<SelectedKey, KeyInfo>::Element *E = selection.back(); E; E = E->prev()) {
			const SelectedKey &sk = E->key();
			float t = animation->track_get_key_time(sk.track, sk.key);
			if (t < top_time) {
				top_time = t;
			}
			if (sk.track < top_track) {
				top_track = sk.track;
			}
		}
		ERR_FAIL_COND(top_track == 0x7FFFFFFF || top_time == 1e10);
		
		int start_track = transpose ? _get_track_selected() : top_track;
		EditorUndoRedoManager *undo_redo = EditorUndoRedoManager::get_singleton();
		undo_redo->create_action(TTR("Animation Duplicate Keys"));
		List<Pair<int, float>> new_selection_values;
		for (RBMap<SelectedKey, KeyInfo>::Element *E = selection.back(); E; E = E->prev()) {
			const SelectedKey &sk = E->key();
			float t = animation->track_get_key_time(sk.track, sk.key);
			float dst_time = t + (timeline->get_play_position() - top_time);
			int dst_track = sk.track + (start_track - top_track);
			if (dst_track < 0 || dst_track >= animation->get_track_count()) {
				continue;
			}