Prevent unnecessary reloading of raw tag editor (close #7248)

modules/util/array.js

@@ -1,4 +1,14 @@
 
+// Returns true if a and b have the same elements at the same indices.
+export function utilArrayIdentical(a, b) {
+    var i = a.length;
+    if (i !== b.length) return false;
+    while (i--) {
+        if (a[i] !== b[i]) return false;
+    }
+    return true;
+}
+
 // http://2ality.com/2015/01/es6-set-operations.html
 
 // Difference (a \ b): create a set that contains those elements of set a that are not in set b.