### 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
vbc->add_margin_child(TTR("Scale Ratio:"), scale);
	scale_dialog->connect("confirmed", callable_mp(this, &AnimationTrackEditor::_edit_menu_pressed).bind(EDIT_SCALE_CONFIRM));
	add_child(scale_dialog);
	
	ease_dialog = memnew(ConfirmationDialog);
	ease_dialog->set_title(TTR("Select Transition and Easing"));
	ease_dialog->connect("confirmed", callable_mp(this, &AnimationTrackEditor::_edit_menu_pressed).bind(EDIT_EASE_CONFIRM));
	add_child(ease_dialog);
	GridContainer *ease_grid = memnew(GridContainer);
	ease_grid->set_columns(2);
	ease_dialog->add_child(ease_grid);
	transition_selection = memnew(OptionButton);
	transition_selection->add_item(TTR("Linear", "Transition Type"), Tween::TRANS_LINEAR);
	transition_selection->add_item(TTR("Sine", "Transition Type"), Tween::TRANS_SINE);
	transition_selection->add_item(TTR("Quint", "Transition Type"), Tween::TRANS_QUINT);
	transition_selection->add_item(TTR("Quart", "Transition Type"), Tween::TRANS_QUART);
	transition_selection->add_item(TTR("Quad", "Transition Type"), Tween::TRANS_QUAD);
	transition_selection->add_item(TTR("Expo", "Transition Type"), Tween::TRANS_EXPO);
	transition_selection->add_item(TTR("Elastic", "Transition Type"), Tween::TRANS_ELASTIC);
	transition_selection->add_item(TTR("Cubic", "Transition Type"), Tween::TRANS_CUBIC);
	transition_selection->add_item(TTR("Circ", "Transition Type"), Tween::TRANS_CIRC);
	transition_selection->add_item(TTR("Bounce", "Transition Type"), Tween::TRANS_BOUNCE);
	transition_selection->add_item(TTR("Back", "Transition Type"), Tween::TRANS_BACK);
	transition_selection->add_item(TTR("Spring", "Transition Type"), Tween::TRANS_SPRING);
	transition_selection->select(Tween::TRANS_LINEAR); 
	transition_selection->set_auto_translate(false); 
	ease_selection = memnew(OptionButton);
	ease_selection->add_item(TTR("In", "Ease Type"), Tween::EASE_IN);
	ease_selection->add_item(TTR("Out", "Ease Type"), Tween::EASE_OUT);
	ease_selection->add_item(TTR("InOut", "Ease Type"), Tween::EASE_IN_OUT);