In issue view, remove checking branches and new branch unavailable states

app/assets/javascripts/issue.js

@@ -139,15 +139,12 @@
         return;
       }
       return $.getJSON($container.data('path')).error(function() {
-        $container.find('.checking').hide();
         $container.find('.unavailable').show();
         return new Flash('Failed to check if a new branch can be created.', 'alert');
       }).success(function(data) {
         if (data.can_create_branch) {
-          $container.find('.checking').hide();
           $container.find('.available').show();
         } else {
-          $container.find('.checking').hide();
           return $container.find('.unavailable').show();
         }
       });

app/views/projects/issues/_new_branch.html.haml

 - if can?(current_user, :push_code, @project)
   .pull-right
     #new-branch.new-branch{'data-path' => can_create_branch_namespace_project_issue_path(@project.namespace, @project, @issue)}
-      = link_to '#', class: 'checking btn btn-grouped', disabled: 'disabled' do
-        = icon('spinner spin')
-        Checking branches
       = link_to namespace_project_branches_path(@project.namespace, @project, branch_name: @issue.to_branch_name, issue_iid: @issue.iid),
         method: :post, class: 'btn btn-new btn-inverted btn-grouped has-tooltip available hide', title: @issue.to_branch_name do
         New branch

changelogs/unreleased/re-style-issue-new-branch.yml

+---
+title: Remove checking branches state in issue new branch button
+merge_request: 8023