non-admins cannot close CFDs with more than 50 categories

[NovemLinguae]

Reported by Qwerfjkl at https://en.wikipedia.org/wiki/Wikipedia_talk:XFDcloser#Most_urgent_bugs

Probably hitting the API limit for non-admins. Need to put the API query in a loop, or use the API's continue feature, or something.

[Qwerfjkl]

I suspect it's from

xfdcloser/xfdcloser-src/Controllers/DiscussionViewController.js

Lines 29 to 44 in df2d5b6

	fetchInfoFromApi() {
	const pagesExistencesPromise = API.get({
	action: "query",
	format: "json",
	formatversion: 2,
	titles: this.model.pagesNames,
	prop: "info",
	inprop: "talkid"
	}).then(response => response.query.pages.forEach(page => {
	const pageTitle = mw.Title.newFromText(page.title);
	const talkpageTitle = pageTitle.getTalkPage();
	mw.Title.exist.set(pageTitle.getPrefixedDb(), !page.missing);
	if ( talkpageTitle ) {
	mw.Title.exist.set(talkpageTitle.getPrefixedDb(), !!page.talkid);
	}
	}));

though it might be better to handle this in api.js.