Deprecate bbox and xy parameters to restore_region?

Describe the issue

Summary

RendererAgg.restore_region takes two optional kwargs, bbox and xy, which specify respectively a subregion and and offset for the restoring. These were introduced in b1c784d for manual animations where subregions of specific patterns would be blitted with certain offsets. This was demonstrated in a single example, which was removed in e547d6f, and never used anywhere else.

I would suggest deprecating and then getting rid of the feature: there doesn't seem to be much demand for it (no other use anywhere in the library or the examples); the kind of animation it allows is extremely specific, and likely it should be possible to build something similarly efficient using FigureImage (i.e., drawing a non-resampled array at a given position should really just involve setting the correspoding pixels in the bitmap) anyways.

Also, that means one less thing to implement in mplcairo for feature parity :)

Is there anyone opposed to such a removal?

從 RendererAgg.restore_region 進入點開始，核查其 bbox 和 xy 參數在整個程式庫和範例中的已回報使用情況。檢視此 API 的棄用和移除預期；完成的標準是：在不破壞剩餘使用情況或與 mplcairo 的對等性的前提下，為這項過時功能確定一條已達成共識且完整的移除路徑。