What are you trying to achieve? Do you want to add additional checks before the dialog is shown?
There's no event before the dialog is visible but there are event you can hook into to detect actual changes to a page, see on_page_version_approve and on_page_update
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There's no event before the dialog is visible but there are event you can hook into to detect actual changes to a page, see on_page_version_approve and on_page_update