bug#42801: 26.3; customize-apropos shows bogus State buttons after saving

[Lars Ingebrigtsen]

Mauro Aranda <maurooaranda@gmail.com> writes:

> I can reproduce this bug in Emacs 26.3.  On current master, the bug manifests
> differently: we don't get the State buttons, but we do get the message:
> Symbol's function definition is void: nil
>
> The difference lies in `custom-variable-modified-p' bugging out before we draw
> the bogus State buttons for all options, because it is not supposed to handle
> hidden widgets.
>
> The bug is that Custom-save recalculates the state and redraws all widgets,
> even the hidden ones.  I propose the attached patch, that changes
> Custom-save to only act on edited widgets in the buffer.

Thanks; applied to Emacs 28.1.

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