### 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
params.push_back(arg);
				}
			}
			d["args"] = params;
			EditorUndoRedoManager *undo_redo = EditorUndoRedoManager::get_singleton();
			undo_redo->create_action(TTR("Add Method Track Key"));
			undo_redo->add_do_method(animation.ptr(), "track_insert_key", insert_key_from_track_call_track, insert_key_from_track_call_ofs, d);
			undo_redo->add_undo_method(animation.ptr(), "track_remove_key_at_time", insert_key_from_track_call_track, insert_key_from_track_call_ofs);
			undo_redo->commit_action();
			return;
		}
	}
	EditorNode::get_singleton()->show_warning(TTR("Method not found in object:") + " " + p_method);
}
void AnimationTrackEditor::_key_selected(int p_key, bool p_single, int p_track) {
	ERR_FAIL_INDEX(p_track, animation->get_track_count());
	ERR_FAIL_INDEX(p_key, animation->track_get_key_count(p_track));
	SelectedKey sk;
	sk.key = p_key;
	sk.track = p_track;
	if (p_single) {
		_clear_selection();
	}
	KeyInfo ki;
	ki.pos = animation->track_get_key_time(p_track, p_key);
	selection[sk] = ki;
	_redraw_tracks();
	_update_key_edit();
}
void AnimationTrackEditor::_key_deselected(int p_key, int p_track) {