From 257c58ebeb2de8fe44f83c751b91e09c306aa588 Mon Sep 17 00:00:00 2001
From: Bryce Johnson <bryce@gitlab.com>
Date: Tue, 18 Oct 2016 19:03:10 +0200
Subject: Set webkit-overflow-scrolling to auto for children of body.

---
 CHANGELOG.md                                 |  1 +
 app/assets/stylesheets/framework/files.scss  |  1 -
 app/assets/stylesheets/framework/layout.scss | 12 ++++++++++++
 app/assets/stylesheets/pages/diff.scss       |  1 -
 4 files changed, 13 insertions(+), 2 deletions(-)

diff --git a/CHANGELOG.md b/CHANGELOG.md
index c866696889e..2c4d94c4cc5 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -126,6 +126,7 @@ Please view this file on the master branch, on stable branches it's out of date.
   - API: all unknown routing will be handled with 404 Not Found
   - Add docs for request profiling
   - Delete dynamic environments
+  - Fix buggy iOS tooltip layering behavior.
   - Make guests unable to view MRs on private projects
 
 ## 8.12.7
diff --git a/app/assets/stylesheets/framework/files.scss b/app/assets/stylesheets/framework/files.scss
index 13c1bbf0359..f49d7b92a00 100644
--- a/app/assets/stylesheets/framework/files.scss
+++ b/app/assets/stylesheets/framework/files.scss
@@ -167,7 +167,6 @@
      */
     &.code {
       padding: 0;
-      -webkit-overflow-scrolling: auto; // See https://gitlab.com/gitlab-org/gitlab-ce/issues/13987
     }
   }
 }
diff --git a/app/assets/stylesheets/framework/layout.scss b/app/assets/stylesheets/framework/layout.scss
index 8bb047db2dd..7baa4296abf 100644
--- a/app/assets/stylesheets/framework/layout.scss
+++ b/app/assets/stylesheets/framework/layout.scss
@@ -27,3 +27,15 @@ body {
 .container-limited {
   max-width: $fixed-layout-width;
 }
+
+
+/* The following prevents side effects related to iOS Safari's implementation of -webkit-overflow-scrolling: touch,
+which is applied to the body by jquery.nicescroling plugin to force hardware acceleration for momentum scrolling. Side
+effects are commonly related to inconsisent z-index behavior (e.g. tooltips). By applying the following to direct children
+of the body element here, we negate cascading side effects but allow momentum scrolling to be applied to the body  */
+
+.navbar,
+.page-gutter,
+.page-with-sidebar {
+  -webkit-overflow-scrolling: auto;
+}
diff --git a/app/assets/stylesheets/pages/diff.scss b/app/assets/stylesheets/pages/diff.scss
index bdc82a8f0f5..fe6421f8b3f 100644
--- a/app/assets/stylesheets/pages/diff.scss
+++ b/app/assets/stylesheets/pages/diff.scss
@@ -52,7 +52,6 @@
     background: #fff;
     color: #333;
     border-radius: 0 0 3px 3px;
-    -webkit-overflow-scrolling: auto;
 
     .unfold {
       cursor: pointer;
-- 
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