### 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
{
				float time_min = 0;
				float time_max = animation->get_length();
				for (int i = 0; i < animation->get_track_count(); i++) {
					if (animation->track_get_key_count(i) > 0) {
						float beg = animation->track_get_key_time(i, 0);
						if (beg < time_min) {
							time_min = beg;
						}
						float end = animation->track_get_key_time(i, animation->track_get_key_count(i) - 1);
						if (end > time_max) {
							time_max = end;
						}
					}
				}
				float extra = (zoomw / scale) * 0.5;
				time_max += extra;
				set_min(time_min);
				set_max(time_max);
				if (zoomw / scale < (time_max - time_min)) {
					hscroll->show();
				} else {
					hscroll->hide();
				}
			}
			set_page(zoomw / scale);
			int end_px = (l - get_value()) * scale;
			int begin_px = -get_value() * scale;
			Color notimecol = get_theme_color(SNAME("dark_color_2"), EditorStringName(Editor));
			Color timecolor = color;