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when the select is collapsed.

value isn't sent if the checkbox isn't checked.

generates the form)

this and return true if your plugin has a config thing for AdminPlugins

'true', instead of the testing value.

into a hidden field and a hardcoded string.

the select dropdown for choosing groups, communities etc. is not used for
the element.

to keep it grouped with get_field_sql

while users are browsing around the admin section, as they may have been
made not an admin anymore, or even made into an admin while they were
logged in.

work later to make sure that the user with ID 1 is never involved in the
admin page, as they should always be an admin.