* doc/misc/widget.texi (Utilities): Document widget-choose.
* etc/NEWS: Document the feature (bug#4787).
* lisp/wid-edit.el (widget--simplify-menu): New function, to convert
extended menus into simplified menus when using the menu to prompt
through the minibuffer.
(widget-choose): Accept a keymap menu. When not using x-popup-menu,
simplify the menu with widget--simplify-menu. Document the changes in
the docstring.
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