### 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
undo_redo->add_do_method(animation.ptr(), "track_set_interpolation_loop_wrap", track, loop_wrap);
			undo_redo->add_undo_method(animation.ptr(), "track_set_interpolation_loop_wrap", track, animation->track_get_interpolation_loop_wrap(track));
			undo_redo->commit_action();
			queue_redraw();
		} break;
		case MENU_KEY_INSERT: {
			emit_signal(SNAME("insert_key"), insert_at_pos);
		} break;
		case MENU_KEY_DUPLICATE: {
			emit_signal(SNAME("duplicate_request"));
		} break;
		case MENU_KEY_ADD_RESET: {
			emit_signal(SNAME("create_reset_request"));
		} break;
		case MENU_KEY_DELETE: {
			emit_signal(SNAME("delete_request"));
		} break;
		case MENU_USE_BLEND_ENABLED:
		case MENU_USE_BLEND_DISABLED: {
			bool use_blend = p_index == MENU_USE_BLEND_ENABLED;
			EditorUndoRedoManager *undo_redo = EditorUndoRedoManager::get_singleton();
			undo_redo->create_action(TTR("Change Animation Use Blend"));
			undo_redo->add_do_method(animation.ptr(), "audio_track_set_use_blend", track, use_blend);
			undo_redo->add_undo_method(animation.ptr(), "audio_track_set_use_blend", track, animation->audio_track_is_use_blend(track));
			undo_redo->commit_action();
			queue_redraw();
		} break;
	}
}
void AnimationTrackEdit::cancel_drop() {