From e9a635dc81d38448483cb9acfc51578a6f9cc97b Mon Sep 17 00:00:00 2001
From: saqimtiaz <saq.imtiaz@gmail.com>
Date: Sun, 1 Nov 2020 18:13:52 +0100
Subject: [PATCH] Added intersection filter run prefix (#4959)

---
 .../modules/filterrunprefixes/intersection.js | 30 +++++++++++++++++++
 1 file changed, 30 insertions(+)
 create mode 100644 core/modules/filterrunprefixes/intersection.js

diff --git a/core/modules/filterrunprefixes/intersection.js b/core/modules/filterrunprefixes/intersection.js
new file mode 100644
index 000000000..2874125d4
--- /dev/null
+++ b/core/modules/filterrunprefixes/intersection.js
@@ -0,0 +1,30 @@
+/*\
+title: $:/core/modules/filterrunprefixes/intersection.js
+type: application/javascript
+module-type: filterrunprefix
+
+\*/
+(function(){
+
+/*jslint node: true, browser: true */
+/*global $tw: false */
+"use strict";
+
+/*
+Export our filter prefix function
+*/
+exports.intersection = function(operationSubFunction) {
+	return function(results,source,widget) {
+		if(results.length !== 0) {
+			var secondRunResults = operationSubFunction(source,widget);
+			var firstRunResults = results.splice(0);
+			$tw.utils.each(firstRunResults,function(title) {
+				if(secondRunResults.indexOf(title) !== -1) {
+					results.push(title);
+				}
+			});
+		}
+	};
+};
+
+})();
\ No newline at end of file