Solve dynamically loaded threads not being filtered. Possibly a hack-fix.

This seems like the most appropriate simple fix, hopefully not too wasteful.

templates/themes/overboards/overboard.js

@@ -75,6 +75,8 @@ $(document).ready(function() {
 		addHideButton.call(boardLink);
 		// Trigger an event to let the world know that we have a new thread aboard
 		$(document).trigger('new_post', elem);
+		// Make the post filter (if enabled) re-run on this page to consider new threads.
+		$(document).trigger('filter_page');
 	};
 
 	var attemptLoadNext = function() {