### 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 (get_script_instance()) {
		return Object::cast_to<AnimationTrackEdit>(get_script_instance()->call("create_audio_track_edit").operator Object *());
	}
	return nullptr;
}
AnimationTrackEdit *AnimationTrackEditPlugin::create_animation_track_edit(Object *p_object) {
	if (get_script_instance()) {
		return Object::cast_to<AnimationTrackEdit>(get_script_instance()->call("create_animation_track_edit", p_object).operator Object *());
	}
	return nullptr;
}
void AnimationTrackEditGroup::_notification(int p_what) {
	switch (p_what) {
		case NOTIFICATION_DRAW: {
			Ref<Font> font = get_theme_font(SNAME("font"), SNAME("Label"));
			int font_size = get_theme_font_size(SNAME("font_size"), SNAME("Label"));
			int separation = get_theme_constant(SNAME("h_separation"), SNAME("ItemList"));
			Color color = get_theme_color(SNAME("font_color"), SNAME("Label"));
			if (root && root->has_node(node)) {
				Node *n = root->get_node(node);
				if (n && EditorNode::get_singleton()->get_editor_selection()->is_selected(n)) {
					color = get_theme_color(SNAME("accent_color"), EditorStringName(Editor));