### 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->create_action(TTR("Animation Change Keyframe Time"), UndoRedo::MERGE_ENDS);
	if (existing != -1) {
		undo_redo->add_do_method(animation.ptr(), "track_remove_key_at_time", track, animation->track_get_key_time(track, existing));
	}
	undo_redo->add_do_method(animation.ptr(), "track_remove_key_at_time", track, key_data_cache.time);
	undo_redo->add_do_method(animation.ptr(), "track_insert_key", track, new_time, key_data_cache.value, key_data_cache.transition);
	undo_redo->add_undo_method(animation.ptr(), "track_remove_key_at_time", track, new_time);
	undo_redo->add_undo_method(animation.ptr(), "track_insert_key", track, key_data_cache.time, key_data_cache.value, key_data_cache.transition);
	if (existing != -1) {
		undo_redo->add_undo_method(animation.ptr(), "track_insert_key", track, animation->track_get_key_time(track, existing), animation->track_get_key_value(track, existing), animation->track_get_key_transition(track, existing));
	}
	
	AnimationPlayerEditor *ape = AnimationPlayerEditor::get_singleton();
	if (ape) {
		AnimationTrackEditor *ate = ape->get_track_editor();
		if (ate) {
			undo_redo->add_do_method(ate, "_clear_selection_for_anim", animation);
			undo_redo->add_undo_method(ate, "_clear_selection_for_anim", animation);
			undo_redo->add_do_method(ate, "_select_at_anim", animation, track, new_time);
			undo_redo->add_undo_method(ate, "_select_at_anim", animation, track, key_data_cache.time);
		}
	}
	undo_redo->commit_action();
}
AnimationTrackKeyEditEditor::AnimationTrackKeyEditEditor(Ref<Animation> p_animation, int p_track, real_t p_key_ofs, bool p_use_fps) {
	if (!p_animation.is_valid()) {
		return;
	}
	animation = p_animation;
	track = p_track;