* master: (27 commits)
  Fix commit comment alignment
  minor cleanup in system_hook_spec
  Pre-calculate Emoji digests
  Clear .todo listener
  Change window.location to use turbolinks
  Make entire todo row clickable
  Add 8.6.2 CHANGELOG items
  Ensure uploads dir exists when running backup specs
  Move CarrierWave test env config to separate file
  Remove console logs
  Off the event initially
  Collapsed sidebar opens over instead of pushing content.
  Sidebar collapse update issue
  User selection from collapsed sidebar
  Add json response for user avatar in merge request
  Make changed values visible in minimized sidebar.
  Fixed MergeRequestController spec
  We need `sha` reference from `diff_base_commit` to generate the diff
  Use `diff_base_commit` instead of `target_branch` to generate diffs
  Isolate CarrierWave uploads in test enviroment
  ...

Fix commit comment alignment

Closes #14780

See merge request !3466

Closes #14780

Upgrade coffee-rails to 4.1.1

Includes Rails 5 support.

[See Changelog for more info](https://github.com/rails/coffee-rails/blob/master/CHANGELOG.md#411-dece
mber-18-2015).

Working towards #14286.

See merge request !3398

Expire the exists cache before deletion to ensure project dir actually exists

See merge request !3413

Check if repo exists before attempting to update cache info

See merge request !3414

minor cleanup in system_hook_spec

Clean up extracted from !3439

See merge request !3459

Make entire todo row clickable

Fixes #14547 

I had some issues with timeouts when searching for the selector to click on, so I ended up using `execute_script`. Please let me know if you think there's a better solution

See merge request !3456

Pre-calculate Emoji digests

cc @dzaporozhets @rspeicher 

@marin Do you happen to know if we allow users to configure asset hosts anywhere in Omnibus and such? I've not been able to find any reference to "asset_host" so it seems we don't allow this (which is a good thing as this simplifies the code).

See merge request !3458

By pre-calculating the digests we can manually construct the emoji URLs,
removing the need for using Rails' asset URL helpers. The reason we
don't want to use these helpers for Emojis is two-fold:

1. Rails' image_url() method is slow, really slow. For one it _might_
   have to calculate digests but it also performs a lot of other
   intensive operations (judging by the source code and based on
   measuring timings).

2. We have a lot of Emoji which coupled with the above can result in it
   taking minutes to load Emoji autocomplete data.

Using this pre-calculation setup generating the digests takes around 7
seconds (including the time it takes to start Rails/Rake), and only
around 600 milliseconds to load _all_ the autocomplete data of a project
(measured locally).

This commit _does_ change the Emoji URLs from absolute to relative URLs
as these are much easier to generate.

To update the Emoji data simply run:

    rake gemojione:digests

Then commit any changes.

Fixes gitlab-org/gitlab-ce#14009

Isolate CarrierWave uploads in test enviroment

Purpose of this merge request is to isolate CarrierWave uploads in test environment, from regular development/production uploads.
We need to persist some files in order to test some features thoroughly. If we - for example - want to check if file exists after being uploaded via API, or we need to write tests that check if file has been correctly removed we need to persist uploads using CarrierWave.

This approach simply sets `root` path for uploads in test environment and removes temporary directory after executing RSpec tests suite. We set this in `spec_helper` to keep this in one place, this also can be set up in test environment initializer.

This issue is a workaround for #12968, but does not solve this problem completely, because if uploader defines absolute path in `store_dir` or defines custom `root` path, this may not work correctly (but it looks like we do have such uploaders at this moment).

See merge request !3435

Fall back to In-Reply-To and References headers when sub-addressing is not available

_Originally opened at !3024 by @dabit._

- - -

Fixes #2364 

Summary of the changes:
- No more need to have the `%{key}` placeholder in the `incoming_email.address`
- The fallback message id format is `reply-[key]@[gitlab_host]` (reminder: it doesn't have to be a real email address)
- The fallback message id that includes the reply key is added to both `References` header
- Documentation for the "Reply by email" feature updated

See merge request !3305

Fix Raw / Rendered diff producing different results on merge requests

The raw diff endpoint (`merge_requests/####.diff`) produces a diff based on `target_branch` instead of the original branching point. Same is valid for `merge_requests/####.patch`.

Fixes #14680, #3017

See merge request !3450

Refactor builds badge, encapsulate inside a class

This merge requests attempts to introduce interface for all badges.
Currently we only have a build badge, but other badges are in plans,
like coverage badge.

See merge request !3403

Signed-off-by: Rémy Coutable <remy@rymai.me>

Functional closed sidebar

Adds functionality to include the closed sidebar.

When sidebar is closed the details will be visible once changed in open sidebar.

This MR fixes some bugs and adds some features from https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/3175

Fixes: #13594  

See merge request !3411

This attempts to get CarrierWave's uploader - `FileUploader` into test
harness using a factory. that makes it easier to build an instance of
it.

Along with !3435 it may be easier to use uploaders in tests