Fixed embarrassing bug with the heading wikitext rule

core/modules/parsers/newwikitextparser/rules/heading.js

@@ -39,7 +39,7 @@ exports.regExpString = "!{1,6}";
 exports.parse = function(match,isBlock) {
 	this.pos = match.index + match[0].length;
 	var classedRun = this.parseClassedRun(/(\r?\n)/mg);
-	return [$tw.Tree.Element("h1",{"class": classedRun["class"]},classedRun.tree)];
+	return [$tw.Tree.Element("h" + match[0].length,{"class": classedRun["class"]},classedRun.tree)];
 };
 
 })();