* lisp/textmodes/text-mode.el (center-line-mode--track-changes): New local variable for storing the id of the change tracker registered for the current buffer. (center-line-mode--track-changes-signal): New function to be called by the track-changes library whenever there is a change in the current buffer. (center-line-mode--track-changes-function): New function called from the above signal function, iterates over the lines of the modified region, calling 'center-line' for each non-empty line. (center-line-mode): New minor mode. * etc/NEWS: Document the new minor mode.
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