Fixed issues with sticky mr tabs & sidebar

Closes #23504

app/assets/javascripts/merge_request_tabs.js

@@ -388,8 +388,7 @@
       // So we dont affix the tabs on these
       if (Breakpoints.get().getBreakpointSize() === 'xs' || !$tabs.length) return;
 
-      var tabsWidth = $tabs.outerWidth(),
-        $diffTabs = $('#diff-notes-app'),
+      var $diffTabs = $('#diff-notes-app'),
         offsetTop = $tabs.offset().top - ($('.navbar-fixed-top').height() + $('.layout-nav').height());
 
       $tabs.off('affix.bs.affix affix-top.bs.affix')
@@ -398,18 +397,10 @@
             top: offsetTop
           }
         }).on('affix.bs.affix', function () {
-          $tabs.css({
-            left: $tabs.offset().left,
-            width: tabsWidth
-          });
           $diffTabs.css({
             marginTop: $tabs.height()
           });
         }).on('affix-top.bs.affix', function () {
-          $tabs.css({
-            left: '',
-            width: ''
-          });
           $diffTabs.css({
             marginTop: ''
           });

app/assets/stylesheets/framework/sidebar.scss

@@ -185,6 +185,10 @@ header.header-sidebar-pinned {
 
   @media (min-width: $screen-sm-min) {
     padding-right: $sidebar_collapsed_width;
+
+    .merge-request-tabs-holder.affix {
+      right: $sidebar_collapsed_width;
+    }
   }
 
   .sidebar-collapsed-icon {
@@ -207,6 +211,10 @@ header.header-sidebar-pinned {
 
   @media (min-width: $screen-md-min) {
     padding-right: $gutter_width;
+
+    .merge-request-tabs-holder.affix {
+      right: $gutter_width;
+    }
   }
 
   &.with-overlay {

app/assets/stylesheets/pages/merge_requests.scss

@@ -438,11 +438,18 @@
   }
 }
 
-.merge-request-tabs {
+.merge-request-tabs-holder {
   background-color: #fff;
 
   &.affix {
     top: 100px;
+    left: 0;
     z-index: 9;
+    transition: right .15s;
+  }
+
+  &:not(.affix) .container-fluid {
+    padding-left: 0;
+    padding-right: 0;
   }
 }

app/views/projects/merge_requests/_show.html.haml

@@ -47,7 +47,9 @@
           = link_to "command line", "#modal_merge_info", class: "how_to_merge_link vlink", title: "How To Merge", "data-toggle" => "modal"
 
     - if @commits_count.nonzero?
-      %ul.merge-request-tabs.nav-links.no-top.no-bottom{ class: ("js-tabs-affix" unless ENV['RAILS_ENV'] == 'test') }
+      .merge-request-tabs-holder{ class: ("js-tabs-affix" unless ENV['RAILS_ENV'] == 'test') }
+        %div{ class: container_class }
+          %ul.merge-request-tabs.nav-links.no-top.no-bottom
             %li.notes-tab
               = link_to namespace_project_merge_request_path(@project.namespace, @project, @merge_request), data: { target: 'div#notes', action: 'notes', toggle: 'tab' } do
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