Merge requests search and filtering

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+# Merge requests
+
+Merge requests allow you to exchange changes you made to source code and
+collaborate with other people on the same project.
+
+## Overview
+
+A Merge Request (**MR**) is the basis of GitLab as a code collaboration
+and version control platform.
+Is it simple as the name implies: a _request_ to _merge_ one branch into another.
+
+With GitLab merge requests, you can:
+
+- Compare the changes between two [branches](https://git-scm.com/book/en/v2/Git-Branching-Branches-in-a-Nutshell#_git_branching)
+- [Review and discuss](../../discussions/index.md#discussions) the proposed modifications inline
+- Live preview the changes when [Review Apps](../../../ci/review_apps/index.md) is configured for your project
+- Build, test, and deploy your code in a per-branch basis with built-in [GitLab CI/CD](../../../ci/README.md)
+- Prevent the merge request from being merged before it's ready with [WIP MRs](#work-in-progress-merge-requests)
+- View the deployment process through [Pipeline Graphs](../../../ci/pipelines.md#pipeline-graphs)
+- [Automatically close the issue(s)](../../project/issues/closing_issues.md#via-merge-request) that originated the implementation proposed in the merge request
+- Assign it to any registered user, and change the assignee how many times you need
+- Assign a [milestone](../../project/milestones/index.md) and track the development of a broader implementation
+- Organize your issues and merge requests consistently throughout the project with [labels](../../project/labels.md)
+- Add a time estimation and the time spent with that merge request with [Time Tracking](../../../workflow/time_tracking.html#time-tracking)
+- [Resolve merge conflicts from the UI](#resolve-conflicts)
+
+With **[GitLab Enterprise Edition][ee]**, you can also:
+
+- View the deployment process across projects with [Multi-Project Pipeline Graphs](https://docs.gitlab.com/ee/ci/multi_project_pipeline_graphs.html#multi-project-pipeline-graphs) (available only in GitLab Enterprise Edition Premium)
+- Request [approvals](https://docs.gitlab.com/ee/user/project/merge_requests/merge_request_approvals.html) from your managers (available in GitLab Enterprise Edition Starter)
+- Enable [fast-forward merge requests](https://docs.gitlab.com/ee/user/project/merge_requests/fast_forward_merge.html) (available in GitLab Enterprise Edition Starter)
+- [Squash and merge](https://docs.gitlab.com/ee/user/project/merge_requests/squash_and_merge.html) for a cleaner commit history (available in GitLab Enterprise Edition Starter)
+- Enable [semi-linear history merge requests](https://docs.gitlab.com/ee/user/project/merge_requests/index.html#semi-linear-history-merge-requests) as another security layer to guarantee the pipeline is passing in the target branch (available in GitLab Enterprise Edition Starter)
+- Analise the impact of your changes with [Code Quality reports](https://docs.gitlab.com/ee/user/project/merge_requests/code_quality_diff.html) (available in GitLab Enterprise Edition Starter)
+
+## Use cases
+
+A. Consider you are a software developer working in a team:
+
+1. You checkout a new branch, and submit your changes through a merge request
+1. You gather feedback from your team
+1. You work on the implementation optimizing code with [Code Quality reports](https://docs.gitlab.com/ee/user/project/merge_requests/code_quality_diff.html) (available in GitLab Enterprise Edition Starter)
+1. You build and test your changes with GitLab CI/CD
+1. You request the approval from your manager
+1. Your manager pushes a commit with his final review, [approves the merge request](https://docs.gitlab.com/ee/user/project/merge_requests/merge_request_approvals.html), and set it to [merge when pipeline succeeds](#merge-when-pipeline-succeeds) (Merge Request Approvals are available in GitLab Enterprise Edition Starter)
+1. Your changes get deployed to production with [manual actions](../../../ci/yaml/README.md#manual-actions) for GitLab CI/CD
+1. Your implementations were successfully shipped to your customer
+
+B. Consider you're a web developer writing a webpage for your company's:
+
+1. You checkout a new branch, and submit a new page through a merge request
+1. You gather feedback from your reviewers
+1. Your changes are previewed with [Review Apps](../../../ci/review_apps/index.md)
+1. You request your web designers for their implementation
+1. You request the [approval](https://docs.gitlab.com/ee/user/project/merge_requests/merge_request_approvals.html) from your manager (available in GitLab Enterprise Edition Starter)
+1. Once approved, your merge request is [squashed and merged](https://docs.gitlab.com/ee/user/project/merge_requests/squash_and_merge.html), and [deployed to staging with GitLab Pages](https://about.gitlab.com/2016/08/26/ci-deployment-and-environments/) (Squash and Merge is available in GitLab Enterprise Edition Starter)
+1. Your production team [cherry picks](#cherry-pick-changes) the merge commit into production
+
+
+## Merge request list views, searching, and filtering
+
+View all the merge requests within a project by navigating to **Project > Merge Requests**. 
+There are tabs to quickly filter by open, merged, and closed merge requests.
+
+![Project merge requests list view](img/project_merge_requests_list_view.png)
+
+[Search and filter the results](../../search/index.md#issues-and-merge-requests-per-project).
+
+View all the merge requests in a group (that is, all the merge requests across all projects in that
+group) by navigating to **Group > Merge Requests**. This view also has the open, merged, and closed
+merge request tabs.
+
+![Group Issues list view](img/group_merge_requests_list_view.png)
+
+[Search and filter the results](../../search/index.md#issues-and-merge-requests-per-group).
+
+## Authorization for merge requests
+
+There are two main ways to have a merge request flow with GitLab:
+
+1. Working with [protected branches][] in a single repository
+1. Working with forks of an authoritative project
+
+[Learn more about the authorization for merge requests.](authorization_for_merge_requests.md)
+
+## Cherry-pick changes
+
+Cherry-pick any commit in the UI by simply clicking the **Cherry-pick** button
+in a merged merge requests or a commit.
+
+[Learn more about cherry-picking changes.](cherry_pick_changes.md)
+
+## Merge when pipeline succeeds
+
+When reviewing a merge request that looks ready to merge but still has one or
+more CI jobs running, you can set it to be merged automatically when CI
+pipeline succeeds. This way, you don't have to wait for the pipeline to finish
+and remember to merge the request manually.
+
+[Learn more about merging when pipeline succeeds.](merge_when_pipeline_succeeds.md)
+
+## Resolve discussion comments in merge requests reviews
+
+Keep track of the progress during a code review with resolving comments.
+Resolving comments prevents you from forgetting to address feedback and lets
+you hide discussions that are no longer relevant.
+
+[Read more about resolving discussion comments in merge requests reviews.](../../discussions/index.md)
+
+## Resolve conflicts
+
+When a merge request has conflicts, GitLab may provide the option to resolve
+those conflicts in the GitLab UI.
+
+[Learn more about resolving merge conflicts in the UI.](resolve_conflicts.md)
+
+## Revert changes
+
+GitLab implements Git's powerful feature to revert any commit with introducing
+a **Revert** button in merge requests and commit details.
+
+[Learn more about reverting changes in the UI](revert_changes.md)
+
+## Merge requests versions
+
+Every time you push to a branch that is tied to a merge request, a new version
+of merge request diff is created. When you visit a merge request that contains
+more than one pushes, you can select and compare the versions of those merge
+request diffs.
+
+[Read more about the merge requests versions.](versions.md)
+
+## Work In Progress merge requests
+
+To prevent merge requests from accidentally being accepted before they're
+completely ready, GitLab blocks the "Accept" button for merge requests that
+have been marked as a **Work In Progress**.
+
+[Learn more about settings a merge request as "Work In Progress".](work_in_progress_merge_requests.md)
+
+## Ignore whitespace changes in Merge Request diff view
+
+If you click the **Hide whitespace changes** button, you can see the diff
+without whitespace changes (if there are any). This is also working when on a
+specific commit page.
+
+![MR diff](img/merge_request_diff.png)
+
+>**Tip:**
+You can append `?w=1` while on the diffs page of a merge request to ignore any
+whitespace changes.
+
+## Live preview with Review Apps
+
+If you configured [Review Apps](https://about.gitlab.com/features/review-apps/) for your project,
+you can preview the changes submitted to a feature-branch through a merge request
+in a per-branch basis. No need to checkout the branch, install and preview locally;
+all your changes will be available to preview by anyone with the Review Apps link.
+
+[Read more about Review Apps.](../../../ci/review_apps/index.md)
+
+
+## Tips
+
+Here are some tips that will help you be more efficient with merge requests in
+the command line.
+
+> **Note:**
+This section might move in its own document in the future.
+
+### Checkout merge requests locally
+
+A merge request contains all the history from a repository, plus the additional
+commits added to the branch associated with the merge request. Here's a few
+tricks to checkout a merge request locally.
+
+Please note that you can checkout a merge request locally even if the source
+project is a fork (even a private fork) of the target project.
+
+#### Checkout locally by adding a git alias
+
+Add the following alias to your `~/.gitconfig`:
+
+```
+[alias]
+    mr = !sh -c 'git fetch $1 merge-requests/$2/head:mr-$1-$2 && git checkout mr-$1-$2' -
+```
+
+Now you can check out a particular merge request from any repository and any
+remote. For example, to check out the merge request with ID 5 as shown in GitLab
+from the `upstream` remote, do:
+
+```
+git mr upstream 5
+```
+
+This will fetch the merge request into a local `mr-upstream-5` branch and check
+it out.
+
+#### Checkout locally by modifying `.git/config` for a given repository
+
+Locate the section for your GitLab remote in the `.git/config` file. It looks
+like this:
+
+```
+[remote "origin"]
+  url = https://gitlab.com/gitlab-org/gitlab-ce.git
+  fetch = +refs/heads/*:refs/remotes/origin/*
+```
+
+You can open the file with:
+
+```
+git config -e
+```
+
+Now add the following line to the above section:
+
+```
+fetch = +refs/merge-requests/*/head:refs/remotes/origin/merge-requests/*
+```
+
+In the end, it should look like this:
+
+```
+[remote "origin"]
+  url = https://gitlab.com/gitlab-org/gitlab-ce.git
+  fetch = +refs/heads/*:refs/remotes/origin/*
+  fetch = +refs/merge-requests/*/head:refs/remotes/origin/merge-requests/*
+```
+
+Now you can fetch all the merge requests:
+
+```
+git fetch origin
+
+...
+From https://gitlab.com/gitlab-org/gitlab-ce.git
+ * [new ref]         refs/merge-requests/1/head -> origin/merge-requests/1
+ * [new ref]         refs/merge-requests/2/head -> origin/merge-requests/2
+...
+```
+
+And to check out a particular merge request:
+
+```
+git checkout origin/merge-requests/1
+```
+
+[protected branches]: ../protected_branches.md
+[ee]: https://about.gitlab.com/gitlab-ee/ "GitLab Enterprise Edition"
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