From 39d7861f34e01933ebee4f6b05e3ed24bca7f116 Mon Sep 17 00:00:00 2001
From: matus <matus@ventes.io>
Date: Sat, 9 Jan 2016 03:20:40 +0800
Subject: [PATCH] Scrollspy selecting the last element when at the bottom of
 the page (fixes #17739)

---
 js/src/scrollspy.js | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/js/src/scrollspy.js b/js/src/scrollspy.js
index 98582f9182..9b39acd362 100644
--- a/js/src/scrollspy.js
+++ b/js/src/scrollspy.js
@@ -196,12 +196,17 @@ const ScrollSpy = (($) => {
       )
     }
 
+    _getOffsetHeight() {
+      return this._scrollElement === window ?
+          window.innerHeight : this._scrollElement.offsetHeight
+    }
+
     _process() {
       const scrollTop    = this._getScrollTop() + this._config.offset
       const scrollHeight = this._getScrollHeight()
       const maxScroll    = this._config.offset
         + scrollHeight
-        - this._scrollElement.offsetHeight
+        - this._getOffsetHeight()
 
       if (this._scrollHeight !== scrollHeight) {
         this.refresh()
@@ -213,6 +218,7 @@ const ScrollSpy = (($) => {
         if (this._activeTarget !== target) {
           this._activate(target)
         }
+        return
       }
 
       if (this._activeTarget && scrollTop < this._offsets[0]) {