customize-changed

customize-changed is an alias for `customize-changed-options' in `cus-edit.el'.


(customize-changed &optional SINCE-VERSION)

Customize all settings whose meanings have changed in Emacs itself.
This includes new user options and faces, and new customization
groups, as well as older options and faces whose meanings or
default values have changed since the previous major Emacs
release.

With argument SINCE-VERSION (a string), customize all settings
that were added or redefined since that version.