### 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
ClassDB::bind_method("_animation_update", &AnimationTrackEditor::_animation_update);
	ClassDB::bind_method("_track_grab_focus", &AnimationTrackEditor::_track_grab_focus);
	ClassDB::bind_method("_redraw_tracks", &AnimationTrackEditor::_redraw_tracks);
	ClassDB::bind_method("_clear_selection_for_anim", &AnimationTrackEditor::_clear_selection_for_anim);
	ClassDB::bind_method("_select_at_anim", &AnimationTrackEditor::_select_at_anim);
	ClassDB::bind_method("_clear_selection", &AnimationTrackEditor::_clear_selection);
	ClassDB::bind_method(D_METHOD("_bezier_track_set_key_handle_mode", "animation", "track_idx", "key_idx", "key_handle_mode", "key_handle_set_mode"), &AnimationTrackEditor::_bezier_track_set_key_handle_mode, DEFVAL(Animation::HANDLE_SET_MODE_NONE));
	ADD_SIGNAL(MethodInfo("timeline_changed", PropertyInfo(Variant::FLOAT, "position"), PropertyInfo(Variant::BOOL, "drag"), PropertyInfo(Variant::BOOL, "timeline_only")));
	ADD_SIGNAL(MethodInfo("keying_changed"));
	ADD_SIGNAL(MethodInfo("animation_len_changed", PropertyInfo(Variant::FLOAT, "len")));
	ADD_SIGNAL(MethodInfo("animation_step_changed", PropertyInfo(Variant::FLOAT, "step")));
}
void AnimationTrackEditor::_pick_track_filter_text_changed(const String &p_newtext) {