GitLab

(occur-edit-mode-map): Bind C-c C-c to occur-cease-edit and C-o to
occur-mode-display-occurrence.
(occur-edit-mode): Add usage message.
(occur-cease-edit): New command.
(occur-after-change-function): Use text properties to find the
position of the prefix text.
(occur-engine): Set stickiness of prefix text properties.

Fixes: debbugs:8463