### 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
Size2 ms = add_track->get_minimum_size();
	Ref<Font> font = get_theme_font(SNAME("font"), SNAME("Label"));
	int font_size = get_theme_font_size(SNAME("font_size"), SNAME("Label"));
	ms.height = MAX(ms.height, font->get_height(font_size));
	ms.width = get_buttons_width() + add_track->get_minimum_size().width + get_editor_theme_icon(SNAME("Hsize"))->get_width() + 2;
	return ms;
}
void AnimationTimelineEdit::set_zoom(Range *p_zoom) {
	zoom = p_zoom;
	zoom->connect("value_changed", callable_mp(this, &AnimationTimelineEdit::_zoom_changed));
}
void AnimationTimelineEdit::set_track_edit(AnimationTrackEdit *p_track_edit) {
	track_edit = p_track_edit;
}
void AnimationTimelineEdit::set_play_position(float p_pos) {
	play_position_pos = p_pos;
	play_position->queue_redraw();
}
float AnimationTimelineEdit::get_play_position() const {