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widgets with dynamic-choice

From: Ted Zlatanov
Subject: widgets with dynamic-choice
Date: Mon, 18 Jul 2016 12:53:53 -0400
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/25.1.50 (gnu/linux)

I've needed widgets with dynamic choices many times for Customize.
Stefan also suggested a `dynamic-choice' would be handy. So, I wanted to
ask some questions before we write code:

* what should it look like? Just a callable symbol or a form or
  something else?

* when should the widget get updated?

* how do we deal with outliers like a dynamic 100000 element list?

* how are errors handled? do we empty the list or go back to the last
  good version?

* should this just be a way to provide 'choice and 'radio, or do we want
  a more generic facility that can handle the other composite types?


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