### 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
AnimationPlayer *player = AnimationPlayerEditor::get_singleton()->get_player();
	edit->get_popup()->set_item_disabled(edit->get_popup()->get_item_index(EDIT_APPLY_RESET), !player->can_apply_reset());
}
void AnimationTrackEditor::goto_prev_step(bool p_from_mouse_event) {
	if (animation.is_null()) {
		return;
	}
	float anim_step = animation->get_step();
	if (anim_step == 0) {
		anim_step = 1;
	}
	if (p_from_mouse_event && Input::get_singleton()->is_key_pressed(Key::SHIFT)) {
		
		
		anim_step *= 0.25;
	}
	float pos = timeline->get_play_position();
	pos = Math::snapped(pos - anim_step, anim_step);
	if (pos < 0) {
		pos = 0;
	}
	set_anim_pos(pos);
	emit_signal(SNAME("timeline_changed"), pos, true, false);
}
void AnimationTrackEditor::goto_next_step(bool p_from_mouse_event, bool p_timeline_only) {