Former-commit-id: 13fee27f

Labels should be visible in dashboard and group milestone views

Closes #13621

See merge request !2931

Former-commit-id: 903aa7c9

Add support for cross project references for labels

## Summary

Support for cross project references for labels.

## Rationale

1.   Cross project label references are currently not supported in GitLab
1.   `to_reference` method signature in `Label` model breaks the abstraction introduced in `Referable`.

      `concerns/referable.rb:  def to_reference(_from_project = nil)`

      Signatures:

      ```
      label.rb:           def to_reference(format = :id)

      commit_range.rb:    def to_reference(from_project = nil)
      commit.rb:          def to_reference(from_project = nil)
      external_issue.rb:  def to_reference(_from_project = nil)
      group.rb:           def to_reference(_from_project = nil)
      issue.rb:           def to_reference(from_project = nil)
      merge_request.rb:   def to_reference(from_project = nil)
      milestone.rb:       def to_reference(from_project = nil)
      project.rb:         def to_reference(_from_project = nil)
      snippet.rb:         def to_reference(from_project = nil)
      user.rb:            def to_reference(_from_project = nil)
      ```

     This MR suggests using `def to_reference(from_project = nil, format: :id)` which makes use of keyword arguments and preserves abstract interface.

1.   We need support for cross project label references when we want to move issue to another project

     It may happen that issue description, system notes or comments contain reference to label and this reference will be invalid after moving issue to another project and will not be displayed correctly unless we have support for cross project references.

     Merge request that needs this feature: https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/2831


I think that cross project label references may be useful, (example: `Hey, see our issues for CI in GitLab CE! - gitab-org/gitlab-ce~"CI"`).

cc @JobV @DouweM @rspeicher 

See merge request !2966

Former-commit-id: 99f08b3f

More Factory cleanup

Addresses nitpicks from https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/2847

See merge request !3108

Former-commit-id: eab7892d

Indicate when an MR diverged from the target branch

This adds an indicator to the "Merge MR" box, to tell if and how much an MR diverged from its target branch.

For instance, consider an MR to merge the branch `feature` into `master`. Some other commits were added to `master` since `feature` was created, and the two branches diverged.

```text
o master
|
o    o feature
|    |
o    o
|  /
o
```

In this case, there will be a label in the MR Merge box stating:

> This MR is by 3 commits behind the target branch `master`.

## Screenshots

### The branch diverged from the target (UI Proposal)

![UI_suggestion_1](/uploads/cd5bee3959e68026ec7d5097259d53f4/UI_suggestion_1.png)

### The branch diverged from the target (alternative UI Proposal)

![UI_suggestion_2](/uploads/f36977101b59a610850e129837dfbc83/UI_suggestion_2.png)

## How is this useful?

- In a _rebase-workflow_ (MR are preferably rebased before being merged), the reviewer wants to know if an MR is rebased on the target branch before merging it. 
    
    _With this indicator, the reviewer knows immediately if the branch is rebased, or if she needs to ask the committer to rebase its branch._

<br>

- To keep the git history readable, a team prefers to avoid merging branches that really lag a lot behind the target branch. Merging an MR that is 10 commits behind is fine, but 200 is too much.

    _With this indicator, the reviewer can see on the MR page if the branch is really far behind the target – or only a few commits behind._

## Open questions

We've been using this at @captaintrain for a few months now, and found it quite useful.

I guess the open-questions are mostly: what UI would be the more adequate? Any thoughts on this, on the general usefulness and/or on the code?

See merge request !2217

Former-commit-id: d43c7784

# Conflicts:
#	app/models/note.rb


Former-commit-id: be1ae2d6

Remove unused DiffLine model

Added in Mar 2014. Only usage removed in Sep 2014.

See merge request !3105

Former-commit-id: 49d7a293

Make better use of the `Note#for_*?` methods

We've got all these polymorphic type-checking methods, might as well use
'em everywhere it makes sense.

See merge request !3106

Former-commit-id: de872f26

Minor Note model cleanup

Remove `Note#noteable_type_name`

This method was added in Dec 2012, its single use was removed two days
later, and it's been there ever since.

---

Remove `Note#system?` "override"

This method was duplicating default Rails behavior.

See merge request !3104

Former-commit-id: 20ed08ed

Former-commit-id: 95b06a62

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Former-commit-id: de944c91

Former-commit-id: 042b047f

Add a TL;DR version in quickstart guide



See merge request !3026

Former-commit-id: b8a1f1c4

Former-commit-id: 84dab62c

We've got all these polymorphic type-checking methods, might as well use
'em everywhere it makes sense.


Former-commit-id: dcbf7d13

Added in Mar 2014. Only usage removed in Sep 2014.


Former-commit-id: 1c6fa9ff

Reduce progress bar noise during brakeman run

See merge request !3101

Former-commit-id: 9bbf873e

This method was duplicating default Rails behavior.


Former-commit-id: 1b27c3c5

This method was added in Dec 2012, its single use was removed two days
later, and it's been there ever since.


Former-commit-id: eb3ca328

Former-commit-id: b3f533c3

Upgrade carrierwave to 0.10.0.

Closes #2805 

See merge request !3084

Former-commit-id: 28bee175

Issue sidebar mobile

Fixes #13592 
Fixes #14037 

See merge request !3050

Former-commit-id: 14df110b

Closes #13628


Former-commit-id: c91554de

Former-commit-id: baa782ac

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Former-commit-id: e0a18829

Former-commit-id: 32f8fc1f

* Add Labels tab to Groups
* Add decorator for label so it's aware of Milestones.


Former-commit-id: ed480855

Former-commit-id: 834b5d49

With this change we avoid doing N+1 queries when viewing Milestone's
Issues/MRs from a Group context.


Former-commit-id: e805becf

Former-commit-id: 37d92d0b

Former-commit-id: 70028d36

Make methods return ActiveRecord Relations instead of Arrays.


Former-commit-id: a056dfa9

Former-commit-id: efe7a6b0

Properly display YAML front matter in Markdown

See merge request !3072

Former-commit-id: 0c7626f3