Remove unused 'close' arg to show().

[anntzer]

For reference, _Backend_ipympl.show is effectively the function that pyplot.show calls (pyplot.show even copies the signature of the backend show).

In af699c2, a 'close' kwarg was added to _Backend_ipympl.show, although any use of it was immediately removed in a subsequent commit (783419b). Still, this change means that calling e.g. plt.show(True), for example, would no longer set block=True, but instead set close=True. As the change is relatively recent, it seems better to remove the unused 'close' kwarg again, which also makes the signature consistent with the builtin Matplotlib backends.

[github-actions[bot]]

:point_left: Launch a binder notebook on branch anntzer/ipympl/unclose

[ianhi]

Makes sense to me. Thanks for updating here as you go on the main repo :)

Only concern is the visual regression test failing. Maybe arestart will help

[anntzer]

@ianhi AFAICT the same visual regression test also failed previously with https://github.com/matplotlib/ipympl/actions/runs/2333504817?