Merge branch 'merge-conflicts-editor-2' into 'master'

Resolve Merge conflicts in editor

## What does this MR do?

This is the second iteration of https://gitlab.com/gitlab-org/gitlab-ce/issues/20344 which now allows to resolve conflicts manually providing an editor to the user.

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

- Previous implementation has been refactored almost from the ground up.
- Also some components like `parallel-conflict-lines` has been optimized to work well with PhantomJS.
- The app and files required files are loaded only when needed. `merge_conflicts_bundle.js` is only loaded in `/<group>/<project>/merge_requests/<Id>/conflicts` only

## Why was this MR needed?

Some MRs were unable to be solved interactively in the UI, with this MR we let the user to manually fix complex merge request conflicts.

## Screenshots (if relevant)

<img src="/uploads/33a016f025bd590b1fc6eeee1ee11626/Screen_Shot_2016-09-19_at_1.39.39_PM.png" width="800">

## 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
- [ ] Conform by the [merge request performance guides](http://docs.gitlab.com/ce/development/merge_request_performance_guidelines.html)
- [ ] 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 you do - rebase it please)
- [ ] [Squashed related commits together](https://git-scm.com/book/en/Git-Tools-Rewriting-History#Squashing-Commits)

## What are the relevant issue numbers?

Closes https://gitlab.com/gitlab-org/gitlab-ce/issues/20344, https://gitlab.com/gitlab-org/gitlab-ce/issues/3567.

See merge request !6374

3 files changed, 3 insertions, 0 deletions

diff --git a/config/application.rb b/config/application.rb
index 962ffe0708d..8a9c539cb43 100644
--- a/config/application.rb
+++ b/config/application.rb
@@ -89,6 +89,7 @@ module Gitlab
     config.assets.precompile << "profile/profile_bundle.js"
     config.assets.precompile << "diff_notes/diff_notes_bundle.js"
     config.assets.precompile << "boards/boards_bundle.js"
+    config.assets.precompile << "merge_conflicts/merge_conflicts_bundle.js"
     config.assets.precompile << "boards/test_utils/simulate_drag.js"
     config.assets.precompile << "blob_edit/blob_edit_bundle.js"
     config.assets.precompile << "snippet/snippet_bundle.js"
diff --git a/config/initializers/metrics.rb b/config/initializers/metrics.rb
index be22085b0df..3b8771543e4 100644
--- a/config/initializers/metrics.rb
+++ b/config/initializers/metrics.rb
@@ -67,6 +67,7 @@ if Gitlab::Metrics.enabled?
       ['app', 'finders']                    => ['app', 'finders'],
       ['app', 'mailers', 'emails']          => ['app', 'mailers'],
       ['app', 'services', '**']             => ['app', 'services'],
+      ['lib', 'gitlab', 'conflicts']        => ['lib'],
       ['lib', 'gitlab', 'diff']             => ['lib'],
       ['lib', 'gitlab', 'email', 'message'] => ['lib'],
       ['lib', 'gitlab', 'checks']           => ['lib']
diff --git a/config/routes/project.rb b/config/routes/project.rb
index 2cd8c60794a..711a59df744 100644
--- a/config/routes/project.rb
+++ b/config/routes/project.rb
@@ -267,6 +267,7 @@ resources :namespaces, path: '/', constraints: { id: /[a-zA-Z.0-9_\-]+/ }, only:
           get :commits
           get :diffs
           get :conflicts
+          get :conflict_for_path
           get :builds
           get :pipelines
           get :merge_check