From e0530f39fa1f094aff2d3c8ddd8bf35fac798245 Mon Sep 17 00:00:00 2001
From: Nick Williams <WickyNilliams@users.noreply.github.com>
Date: Wed, 18 Sep 2019 16:04:33 +0100
Subject: [PATCH] Revert "remove async behaviour of init. fixes #338"

---
 cypress/integration/headroom.spec.js |  2 ++
 src/Headroom.js                      | 22 ++++++++++++++++------
 2 files changed, 18 insertions(+), 6 deletions(-)

diff --git a/cypress/integration/headroom.spec.js b/cypress/integration/headroom.spec.js
index fba7b09..311ee11 100644
--- a/cypress/integration/headroom.spec.js
+++ b/cypress/integration/headroom.spec.js
@@ -6,6 +6,7 @@ describe("Headroom", function() {
       win.hr = new win.Headroom(win.document.querySelector("header"), options);
       win.hr.init();
     });
+    cy.wait(200);
   };
 
   beforeEach(() => {
@@ -261,6 +262,7 @@ describe("Headroom", function() {
         bottom: false
       });
     });
+    cy.wait(20).then(() => {});
 
     cy.scrollTo(0, 0);
     cy.should(() => {
diff --git a/src/Headroom.js b/src/Headroom.js
index adca1b0..ec7d627 100644
--- a/src/Headroom.js
+++ b/src/Headroom.js
@@ -34,7 +34,19 @@ Headroom.prototype = {
     if (Headroom.cutsTheMustard && !this.initialised) {
       this.addClass("initial");
       this.initialised = true;
-      this.scrollTracker = trackScroll(this.scroller, this.update.bind(this));
+
+      // defer event registration to handle browser
+      // potentially restoring previous scroll position
+      setTimeout(
+        function(self) {
+          self.scrollTracker = trackScroll(
+            self.scroller,
+            self.update.bind(self)
+          );
+        },
+        100,
+        this
+      );
     }
 
     return this;
@@ -45,11 +57,9 @@ Headroom.prototype = {
    * @public
    */
   destroy: function() {
-    if (this.initialised) {
-      this.initialised = false;
-      Object.keys(this.classes).forEach(this.removeClass, this);
-      this.scrollTracker.destroy();
-    }
+    this.initialised = false;
+    Object.keys(this.classes).forEach(this.removeClass, this);
+    this.scrollTracker.destroy();
   },
 
   /**