Merge branch '18435-autocomplete-is-not-performant' into 'master'

Make autocomplete request performant

## What does this MR do?

Restricts the `autocomplete_sources`action to returning the `json`of one specific `at` type at a time.

Makes sure all commands start by immediately showing the `loading` dropdown.

If the `loading` dropdown is active, we will request and load in the data for that specific `at` type. We manually trigger the filter again. This time, if `loading` dropdown is not active, initiate default filter behaviour and use the correct data template.

Also fixes an issue where `setup` was called multiple times by only setting up and destroying atwho on a focused/blured input.

## Are there points in the code the reviewer needs to double check?

## Why was this MR needed?

`autocomplete_sources` was requested on page load and is large.

## Screenshots (if relevant)

3 requests for 3 different first-time references.

![Screen_Shot_2016-10-14_at_14.43.12](/uploads/0b04eab0d0bf3638d6d6e431036b8089/Screen_Shot_2016-10-14_at_14.43.12.png)

## Does this MR meet the acceptance criteria?

- [x] [CHANGELOG](https://gitlab.com/gitlab-org/gitlab-ce/blob/master/CHANGELOG) entry added
- [ ] [Documentation created/updated](https://gitlab.com/gitlab-org/gitlab-ce/blob/master/doc/development/doc_styleguide.md)
- [ ] API support added
- Tests
  - [x] Added for this feature/bug
  - [x] All builds are passing
- [x] Conform by the [merge request performance guides](http://docs.gitlab.com/ce/development/merge_request_performance_guidelines.html)
- [x] Conform by the [style guides](https://gitlab.com/gitlab-org/gitlab-ce/blob/master/CONTRIBUTING.md#style-guides)
- [x] Branch has no merge conflicts with `master` (if it does - rebase it please)
- [x] [Squashed related commits together](https://git-scm.com/book/en/Git-Tools-Rewriting-History#Squashing-Commits)

## What are the relevant issue numbers?

Closes #22802

Closes #18435

See merge request !6856

1 files changed, 12 insertions, 1 deletions

diff --git a/config/routes/project.rb b/config/routes/project.rb
index 0754f0ec3b0..e17d6bae10c 100644
--- a/config/routes/project.rb
+++ b/config/routes/project.rb
@@ -11,6 +11,18 @@ constraints(ProjectUrlConstrainer.new) do
           module: :projects,
           as: :project) do
 
+      resources :autocomplete_sources, only: [] do
+        collection do
+          get 'emojis'
+          get 'members'
+          get 'issues'
+          get 'merge_requests'
+          get 'labels'
+          get 'milestones'
+          get 'commands'
+        end
+      end
+
       #
       # Templates
       #
@@ -316,7 +328,6 @@ constraints(ProjectUrlConstrainer.new) do
         post :remove_export
         post :generate_new_export
         get :download_export
-        get :autocomplete_sources
         get :activity
         get :refs
         put :new_issue_address