diff -r c7c34916027a -r 177826044cd9 wp/wp-includes/js/dist/priority-queue.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/wp/wp-includes/js/dist/priority-queue.js	Mon Oct 14 18:28:13 2019 +0200
@@ -0,0 +1,173 @@
+this["wp"] = this["wp"] || {}; this["wp"]["priorityQueue"] =
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+/************************************************************************/
+/******/ ({
+
+/***/ 346:
+/***/ (function(module, __webpack_exports__, __webpack_require__) {
+
+"use strict";
+__webpack_require__.r(__webpack_exports__);
+/* harmony export (binding) */ __webpack_require__.d(__webpack_exports__, "createQueue", function() { return createQueue; });
+var requestIdleCallback = window.requestIdleCallback ? window.requestIdleCallback : window.requestAnimationFrame;
+/**
+ * Creates a context-aware queue that only executes
+ * the last task of a given context.
+ *
+ * @example
+ *```js
+ * import { createQueue } from '@wordpress/priority-queue';
+ *
+ * const queue = createQueue();
+ *
+ * // Context objects.
+ * const ctx1 = {};
+ * const ctx2 = {};
+ *
+ * // For a given context in the queue, only the last callback is executed.
+ * queue.add( ctx1, () => console.log( 'This will be printed first' ) );
+ * queue.add( ctx2, () => console.log( 'This won\'t be printed' ) );
+ * queue.add( ctx2, () => console.log( 'This will be printed second' ) );
+ *```
+ *
+ * @return {Object} Queue object with `add` and `flush` methods.
+ */
+
+var createQueue = function createQueue() {
+  var waitingList = [];
+  var elementsMap = new WeakMap();
+  var isRunning = false;
+
+  var runWaitingList = function runWaitingList(deadline) {
+    do {
+      if (waitingList.length === 0) {
+        isRunning = false;
+        return;
+      }
+
+      var nextElement = waitingList.shift();
+      elementsMap.get(nextElement)();
+      elementsMap.delete(nextElement);
+    } while (deadline && deadline.timeRemaining && deadline.timeRemaining() > 0);
+
+    requestIdleCallback(runWaitingList);
+  };
+
+  var add = function add(element, item) {
+    if (!elementsMap.has(element)) {
+      waitingList.push(element);
+    }
+
+    elementsMap.set(element, item);
+
+    if (!isRunning) {
+      isRunning = true;
+      requestIdleCallback(runWaitingList);
+    }
+  };
+
+  var flush = function flush(element) {
+    if (!elementsMap.has(element)) {
+      return false;
+    }
+
+    elementsMap.delete(element);
+    var index = waitingList.indexOf(element);
+    waitingList.splice(index, 1);
+    return true;
+  };
+
+  return {
+    add: add,
+    flush: flush
+  };
+};
+
+
+/***/ })
+
+/******/ });
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