Add fixed positioning to top level navbar

app/assets/javascripts/merge_request_tabs.js

@@ -353,6 +353,7 @@ import BlobForkSuggestion from './blob/blob_fork_suggestion';
 
     initAffix() {
       const $tabs = $('.js-tabs-affix');
+      const $fixedNav = $('.navbar-gitlab');
 
       // Screen space on small screens is usually very sparse
       // So we dont affix the tabs on these
@@ -371,7 +372,7 @@ import BlobForkSuggestion from './blob/blob_fork_suggestion';
         .affix({
           offset: {
             top: () => (
-              $diffTabs.offset().top - $tabs.height()
+              $diffTabs.offset().top - $tabs.height() - $fixedNav.height()
             ),
           },
         })

app/assets/stylesheets/framework/header.scss

@@ -30,6 +30,9 @@ header {
     background-color: $gray-light;
     border: none;
     border-bottom: 1px solid $border-color;
+    position: fixed;
+    top: 0;
+    width: 100%;
 
     @media (max-width: $screen-xs-min) {
       padding: 0 16px;

app/assets/stylesheets/framework/layout.scss

@@ -25,6 +25,10 @@ body {
 
 .content-wrapper {
   padding-bottom: 100px;
+
+  &:not(.page-with-layout-nav) {
+    margin-top: $header-height;
+  }
 }
 
 .container {

app/assets/stylesheets/framework/nav.scss

@@ -291,6 +291,7 @@
   border-bottom: 1px solid $border-color;
   transition: padding $sidebar-transition-duration;
   text-align: center;
+  margin-top: $header-height;
 
   .container-fluid {
     position: relative;
@@ -428,7 +429,7 @@
       top: ($header-height + 1) * 3;
 
       &.affix {
-        top: 0;
+        top: $header-height;
       }
     }
   }

app/assets/stylesheets/framework/sidebar.scss

@@ -80,6 +80,6 @@
 
   &.affix {
     position: fixed;
-    top: 0;
+    top: $header-height;;
   }
 }

app/views/projects/builds/_sidebar.html.haml

 - builds = @build.pipeline.builds.to_a
 
-%aside.right-sidebar.right-sidebar-expanded.build-sidebar.js-build-sidebar.js-right-sidebar{ data: { "offset-top" => "153", "spy" => "affix" } }
+%aside.right-sidebar.right-sidebar-expanded.build-sidebar.js-build-sidebar.js-right-sidebar{ data: { "offset-top" => "101", "spy" => "affix" } }
   .block.build-sidebar-header.visible-xs-block.visible-sm-block.append-bottom-default
     Job
     %strong ##{@build.id}

app/views/projects/wikis/_sidebar.html.haml

-%aside.right-sidebar.right-sidebar-expanded.wiki-sidebar.js-wiki-sidebar.js-right-sidebar{ data: { "offset-top" => "102", "spy" => "affix" } }
+%aside.right-sidebar.right-sidebar-expanded.wiki-sidebar.js-wiki-sidebar.js-right-sidebar{ data: { "offset-top" => "50", "spy" => "affix" } }
   .block.wiki-sidebar-header.append-bottom-default
     %a.gutter-toggle.pull-right.visible-xs-block.visible-sm-block.js-sidebar-wiki-toggle{ href: "#" }
       = icon('angle-double-right')

app/views/shared/issuable/_sidebar.html.haml

@@ -3,8 +3,7 @@
   = page_specific_javascript_bundle_tag('common_vue')
   = page_specific_javascript_bundle_tag('sidebar')
 
-%aside.right-sidebar.js-right-sidebar{ data: { "offset-top" => "102", "spy" => "affix" }, class: sidebar_gutter_collapsed_class, 'aria-live' => 'polite' }
-  .issuable-sidebar{ data: { endpoint: "#{issuable_json_path(issuable)}" } }
+%aside.right-sidebar.js-right-sidebar{ data: { "offset-top" => "50", "spy" => "affix" }, class: sidebar_gutter_collapsed_class, 'aria-live' => 'polite' }
     - can_edit_issuable = can?(current_user, :"admin_#{issuable.to_ability_name}", @project)
     .block.issuable-sidebar-header
       - if current_user

app/views/shared/milestones/_sidebar.html.haml

-- affix_offset = local_assigns.fetch(:affix_offset, "102")
+- affix_offset = local_assigns.fetch(:affix_offset, "50")
 - project = local_assigns[:project]
 
 %aside.right-sidebar.js-right-sidebar{ data: { "offset-top" => affix_offset, "spy" => "affix" }, class: sidebar_gutter_collapsed_class, 'aria-live' => 'polite' }