使用 `horizontal` + `horizontal_stretch=0` + `position=top-center`/`position=bottom-center` 时, HUD 没有中心并无法通过 `offset_x` 进行偏移

Describe the bug When using horizontal + horizontal_stretch=0 with position=top-center/position=bottom-center, the gap to the left is much larger than the gap to the right of the HUD, making it not aligned to the center. You cannot use offset_x to offset the misalignment.