fix: early button/anchor clicks do nothing

This solves a small UX issue where clicking on a button (or anchor
that is not meant to be ajaxified) before ajaxify.end is called
leads to nothing happening because the appropriate click handler
has not been added.

This code will intercept premature clicks, wait until ajaxify.end
is called, and then re-send the click.

public/src/app.js

@@ -17,6 +17,32 @@ app.cacheBuster = null;
 
 	app.cacheBuster = config['cache-buster'];
 
+	/**
+	 * Occasionally, a button or anchor (not meant to be ajaxified) is clicked before
+	 * ajaxify is ready. Capture that event and re-click it once NodeBB is ready.
+	 *
+	 * e.g. New Topic/Reply, post tools
+	 */
+	var earlyQueue = [];	// once we can ES6, use Set instead
+	var earlyClick = function (ev) {
+		var btnEl = ev.target.closest('button');
+		if (!btnEl && ev.target.closest('a') && ev.target.closest('a').getAttribute('data-ajaxify') === 'false') {
+			btnEl = ev.target.closest('a');
+		}
+		if (btnEl && !earlyQueue.includes(btnEl)) {
+			earlyQueue.push(btnEl);
+			ev.stopImmediatePropagation();
+			ev.preventDefault();
+		}
+	};
+	document.body.addEventListener('click', earlyClick);
+	$(window).on('action:ajaxify.end', function () {
+		document.body.removeEventListener('click', earlyClick);
+		earlyQueue.forEach(function (el) {
+			el.click();
+		});
+	});
+
 	bootbox.setDefaults({
 		locale: config.userLang,
 	});