Fixes issue search form hiding when current_user is nil (guest user)

Fixes the bottom margin of .nav-controls > form (issues list search/filter form) so when a guest views on the field on mobile it is not squished against the issues list

Updated CHANGELOG

navigation tabs and navigation filter search will now stay on the same row until there is no space to

Removed unneeded media queries

CHANGELOG

@@ -168,6 +168,7 @@ v 8.8.0
   - Fixed advice on invalid permissions on upload path !2948 (Ludovic Perrine)
   - Allows MR authors to have the source branch removed when merging the MR. !2801 (Jeroen Jacobs)
   - When creating a .gitignore file a dropdown with templates will be provided
+  - Shows the issue/MR list search/filter form and corrects the mobile styling for guest users. #17562
 
 v 8.7.7
   - Fix import by `Any Git URL` broken if the URL contains a space

app/assets/stylesheets/framework/nav.scss

@@ -171,6 +171,7 @@
     > form {
       display: inline-block;
       margin-top: -1px;
+      margin-bottom: 12px;
     }
 
     .icon-label {
@@ -207,7 +208,7 @@
 
     @media (max-width: $screen-xs-max) {
       padding-bottom: 0;
-
+      width: 100%;
       .btn, form, .dropdown, .dropdown-menu-toggle, .form-control {
         margin: 0 0 10px;
         display: block;
@@ -238,16 +239,6 @@
         margin: 0;
       }
     }
-
-    /* Small devices (tablets, 768px and lower) */
-    @media (max-width: $screen-sm-max) {
-      width: 100%;
-      text-align: left;
-
-      input {
-        width: 300px;
-      }
-    }
   }
 }