(widget-field-at): New function.
(widget-at, widget-field-activate): Use it. (widget-tabable-at): Use `widget-at'. (widget-specify-field): If the terminating character of the widget field (which is read-only) is a newline, put it into a special `boundary' field so that C-n/C-p act more naturally. (widget-field-end): Also don't subtract one if a special `boundary' field has been added after the widget field.
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