From d2ebf0436c00bc79b7941fb2179839e7cbd572db Mon Sep 17 00:00:00 2001
From: Robin Ward <robin.ward@gmail.com>
Date: Mon, 30 May 2016 17:33:40 -0400
Subject: [PATCH] FIX: On small heights jumping to posts was iffy

---
 .../discourse/lib/offset-calculator.js.es6          | 13 ++++++++++---
 1 file changed, 10 insertions(+), 3 deletions(-)

diff --git a/app/assets/javascripts/discourse/lib/offset-calculator.js.es6 b/app/assets/javascripts/discourse/lib/offset-calculator.js.es6
index eaab864c9a..e9413eb771 100644
--- a/app/assets/javascripts/discourse/lib/offset-calculator.js.es6
+++ b/app/assets/javascripts/discourse/lib/offset-calculator.js.es6
@@ -13,8 +13,10 @@ export default function offsetCalculator(y) {
   const $title = $('#topic-title');
   const rawWinHeight = $(window).height();
   const windowHeight = rawWinHeight - $title.height();
-  const expectedOffset = $title.height() - $header.find('.contents').height() + (windowHeight / 5);
-  const ideal = $header.outerHeight(true) + ((expectedOffset < 0) ? 0 : expectedOffset);
+  const eyeTarget = (windowHeight / 10);
+  const headerHeight = $header.outerHeight(true);
+  const expectedOffset = $title.height() - $header.find('.contents').height() + (eyeTarget * 2);
+  const ideal = headerHeight + ((expectedOffset < 0) ? 0 : expectedOffset);
 
   const $container = $('.posts-wrapper');
   const topPos = $container.offset().top;
@@ -23,7 +25,12 @@ export default function offsetCalculator(y) {
   const docHeight = $(document).height();
   const scrollPercent = (scrollTop / (docHeight-rawWinHeight));
 
-  const inter = topPos - scrollTop + ($container.height() * scrollPercent);
+  let inter = topPos - scrollTop + ($container.height() * scrollPercent);
+  if (inter < headerHeight + eyeTarget) {
+    inter = headerHeight + eyeTarget;
+  }
+
+
 
   if (inter > ideal) {
     const bottom = $('#topic-bottom').offset().top;