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_wp_upgrade_revisions_of_post

Upgrade the revisions author, add the current post as a revision and set the revisions version to 1

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_show_post_preview

Filters the latest content for preview from the post autosave.

_set_preview

Sets up the post object for preview based on the post autosave.

wp_revisions_to_keep

Determine how many revisions to retain for a given post.

wp_revisions_to_keep

Filters the number of revisions to save for the given post.

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