Fix compatibility with communication module skins that don't support window_type=self

modules/communication/tpl/js/window_type.js

@@ -0,0 +1,22 @@
+'use strict';
+
+(function($) {
+	$(function() {
+
+		// Find forms that submit to the Communication module.
+		const regexp = /^procCommunication(SendMessage|AddFriend(Group?))$/;
+		const forms = $('form').filter(function() {
+			return String($(this).find('input[name=act]').val()).match(regexp);
+		});
+
+		// Add window_type=self to each form.
+		forms.each(function() {
+			if ($(this).find('input[name=window_type]').length) {
+				return;
+			}
+			const hiddenInput = $('<input type="hidden" name="window_type" value="self" />')
+			hiddenInput.insertAfter($(this).find('input[name=act]'));
+		});
+
+	});
+})(jQuery);