Merge branch '48634-header-navbar-line-seperator-is-missing' into 'master'

Resolve "The  header navbar line separator is missing"

Closes #48634

See merge request gitlab-org/gitlab-ce!20282

app/assets/stylesheets/framework/header.scss

@@ -268,8 +268,6 @@
 
 .navbar-sub-nav,
 .navbar-nav {
-  align-items: center;
-
   > li {
     > a:hover,
     > a:focus {

app/views/layouts/header/_default.html.haml

@@ -21,7 +21,7 @@
           - if current_user
             = render 'layouts/header/new_dropdown'
           - if header_link?(:search)
-            %li.nav-item.d-none.d-sm-none.d-md-block
+            %li.nav-item.d-none.d-sm-none.d-md-block.m-auto
               = render 'layouts/search' unless current_controller?(:search)
             %li.nav-item.d-inline-block.d-sm-none.d-md-none
               = link_to search_path, title: 'Search', aria: { label: "Search" }, data: {toggle: 'tooltip', placement: 'bottom', container: 'body'} do

changelogs/unreleased/48634-header-navbar-line-separator-is-missing.yml

@@ -0,0 +1,5 @@
+---
+title: Line separator to the left of the 'Admin area' wrench icon had vanished
+merge_request: 20282
+author: bitsapien
+type: fixed