GitLab

(ibuffer-occur-match-face): Delete.
(ibuffer-occur-props, ibuffer-occur-mode): Delete.
(ibuffer-occur-mouse-display-occurence): Delete.
(ibuffer-occur-goto-occurence, ibuffer-occur-display-occurence):
Delete.
(ibuffer-do-occur-1, ibuffer-occur-revert-buffer-function):
Delete.
(ibuffer-occur-engine): Moved to replace.el.
(ibuffer-do-occur): Simply call `occur-1'.