### 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_undo_method(animation.ptr(), "track_remove_key_at_time", p_track, p_ofs);
			undo_redo->commit_action();
		} break;
		case Animation::TYPE_BLEND_SHAPE:
		case Animation::TYPE_VALUE: {
			NodePath bp;
			Variant value;
			_find_hint_for_track(p_track, bp, &value);
			undo_redo->create_action(TTR("Add Track Key"));
			undo_redo->add_do_method(animation.ptr(), "track_insert_key", p_track, p_ofs, value);
			undo_redo->add_undo_method(this, "_clear_selection_for_anim", animation);
			undo_redo->add_undo_method(animation.ptr(), "track_remove_key_at_time", p_track, p_ofs);
			undo_redo->commit_action();
		} break;
		case Animation::TYPE_METHOD: {
			if (!root->has_node(animation->track_get_path(p_track))) {
				EditorNode::get_singleton()->show_warning(TTR("Track path is invalid, so can't add a method key."));
				return;
			}
			Node *base = root->get_node(animation->track_get_path(p_track));
			method_selector->select_method_from_instance(base);
			insert_key_from_track_call_ofs = p_ofs;
			insert_key_from_track_call_track = p_track;
		} break;
		case Animation::TYPE_BEZIER: {
			NodePath bp;
			Variant value;
			_find_hint_for_track(p_track, bp, &value);
			Array arr;
			arr.resize(5);