### 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
if (selection.size()) {
				EditorUndoRedoManager *undo_redo = EditorUndoRedoManager::get_singleton();
				undo_redo->create_action(TTR("Animation Delete Keys"));
				for (RBMap<SelectedKey, KeyInfo>::Element *E = selection.back(); E; E = E->prev()) {
					undo_redo->add_do_method(animation.ptr(), "track_remove_key", E->key().track, E->key().key);
					undo_redo->add_undo_method(animation.ptr(), "track_insert_key", E->key().track, E->get().pos, animation->track_get_key_value(E->key().track, E->key().key), animation->track_get_key_transition(E->key().track, E->key().key));
				}
				undo_redo->add_do_method(this, "_clear_selection_for_anim", animation);
				undo_redo->add_undo_method(this, "_clear_selection_for_anim", animation);
				undo_redo->add_do_method(this, "_redraw_tracks");
				undo_redo->add_undo_method(this, "_redraw_tracks");
				undo_redo->commit_action();
				_update_key_edit();
			}
		} break;
		case EDIT_GOTO_NEXT_STEP_TIMELINE_ONLY:
		case EDIT_GOTO_NEXT_STEP: {
			goto_next_step(false, p_option == EDIT_GOTO_NEXT_STEP_TIMELINE_ONLY);
		} break;
		case EDIT_GOTO_PREV_STEP: {
			goto_prev_step(false);
		} break;
		case EDIT_APPLY_RESET: {
			AnimationPlayerEditor::get_singleton()->get_player()->apply_reset(true);
		} break;
		case EDIT_BAKE_ANIMATION: {
			bake_dialog->popup_centered(Size2(200, 100) * EDSCALE);
		} break;
		case EDIT_BAKE_ANIMATION_CONFIRM: {
			EditorUndoRedoManager *undo_redo = EditorUndoRedoManager::get_singleton();