i want to define a rule in the filter that's being triggered, if somebody moves a page that contains "foo", but i cannot.
moved_to_namespace == 2 && new_wikitext contains "foo"
will never be triggered.
"When action='move', only the summary, action, timestamp and user_* variables are available."
i can confirm this by examining any movement, e.g. https://de.wikipedia.org/w/index.php?title=Spezial:Missbrauchsfilter/examine/327398832.
so, i propose to make the content of a page (that's being moved) available in the edit filter.