### 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
hscroll = p_hscroll;
}
void AnimationTimelineEdit::_track_added(int p_track) {
	emit_signal(SNAME("track_added"), p_track);
}
void AnimationTimelineEdit::_bind_methods() {
	ADD_SIGNAL(MethodInfo("zoom_changed"));
	ADD_SIGNAL(MethodInfo("name_limit_changed"));
	ADD_SIGNAL(MethodInfo("timeline_changed", PropertyInfo(Variant::FLOAT, "position"), PropertyInfo(Variant::BOOL, "drag"), PropertyInfo(Variant::BOOL, "timeline_only")));
	ADD_SIGNAL(MethodInfo("track_added", PropertyInfo(Variant::INT, "track")));
	ADD_SIGNAL(MethodInfo("length_changed", PropertyInfo(Variant::FLOAT, "size")));
	ClassDB::bind_method(D_METHOD("update_values"), &AnimationTimelineEdit::update_values);
}
AnimationTimelineEdit::AnimationTimelineEdit() {
	name_limit = 150 * EDSCALE;
	play_position = memnew(Control);
	play_position->set_mouse_filter(MOUSE_FILTER_PASS);
	add_child(play_position);
	play_position->set_anchors_and_offsets_preset(PRESET_FULL_RECT);
	play_position->connect("draw", callable_mp(this, &AnimationTimelineEdit::_play_position_draw));
	add_track = memnew(MenuButton);
	add_track->set_position(Vector2(0, 0));
	add_child(add_track);
	add_track->set_text(TTR("Add Track"));
	len_hb = memnew(HBoxContainer);
	Control *expander = memnew(Control);
	expander->set_h_size_flags(SIZE_EXPAND_FILL);
	len_hb->add_child(expander);