### 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
ERR_FAIL_COND(p_event.is_null());
	if (p_event->is_pressed()) {
		if (ED_GET_SHORTCUT("animation_editor/duplicate_selection")->matches_event(p_event)) {
			if (!read_only) {
				emit_signal(SNAME("duplicate_request"));
			}
			accept_event();
		}
		if (ED_GET_SHORTCUT("animation_editor/duplicate_selection_transposed")->matches_event(p_event)) {
			if (!read_only) {
				emit_signal(SNAME("duplicate_transpose_request"));
			}
			accept_event();
		}
		if (ED_GET_SHORTCUT("animation_editor/delete_selection")->matches_event(p_event)) {
			if (!read_only) {
				emit_signal(SNAME("delete_request"));
			}
			accept_event();
		}
	}
	Ref<InputEventMouseButton> mb = p_event;
	if (mb.is_valid() && mb->is_pressed() && mb->get_button_index() == MouseButton::LEFT) {
		Point2 pos = mb->get_position();
		if (!read_only) {