Less intrusive system note ## What does this MR do? This MR is for making system notes less intrusive by implementing proposed design ## Are there points in the code the reviewer needs to double check? System notes are reusing in issues, commits and MR discussions. May need to double check to make sure that the design is not breaking anywhere ## Why was this MR needed? This merge request solve issue #19797 ## Screenshots (if relevant) **Before:**  **After**  ## Does this MR meet the acceptance criteria? - [x] [CHANGELOG](https://gitlab.com/gitlab-org/gitlab-ce/blob/master/CHANGELOG) entry added - [x] [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? #19797, #23129 See merge request !6755
Slash command for mattermost Closes #22540 ## Does this MR meet the acceptance criteria? - [x] [Changelog entry](https://docs.gitlab.com/ce/development/changelog.html) added - [ ] [Documentation created/updated](https://gitlab.com/gitlab-org/gitlab-ce/blob/master/doc/development/doc_styleguide.md) - 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) See merge request !7438
Use `Gitlab.config.gitlab.host` over `'localhost'` Use `Gitlab.config.gitlab.host` over `'localhost'` This would fix long standing failures running tests on my development machine, which set `Gitlab.config.gitlab.host` to another host because it's not my local computer. Now I finally cannot withstand it and decided to fix them once and for all. See merge request !7562
Improved Ruby code in autocomplete user search ## What does this MR do? Improves the Ruby code for finding users in the assignee dropdown based on the Ruby review. See merge request !7576
Improve consistency of empty todo list messages - They all now end with punctuation - Not everyone enjoys, or can even drink, coffee - The "High five!" message had no context for why we were high-fiving - "Henceforth" is one word [ci skip] See merge request !7572
add parsing support for incoming html email ## What does this MR do? Fixes #18388 by adding support for parsing HTML email ## Are there points in the code the reviewer needs to double check? The new class, Gitlab::Email::HTMLParser, which needs to translate the HTML content to text and also delete replies, as they are not necessarily in the correct format to be caught by EmailReplyParser. The solution I found that should work for any HTML-formatted email is to remove all `<table>` and `<blockquote>` tags. Actual `<table>` elements (to be interpreted by markdown) should already be encoded with e.g. `<table>` - the only failure mode is if there is an *actual* HTML table in the content itself, which we wouldn't be able to support easily anyways. The gem `html2text` traverses the HTML tree and outputs text - and markdown in the case of HTML links or images. See merge request !7397
Resolve "spec/lib/gitlab/backend/shell_spec.rb causes other specs to fail" ## What does this MR do? It ensures we rely on `Gitlab::Shell`'s public API and not on its internal. Since `Gitlab::Shell` is caching the value of its token, the only way to get the correct token is to call `Gitlab::Shell.secret_token`, not to read the `Gitlab.config.gitlab_shell.secret_file` file! Fixes #24599 See merge request !7557
Document how to prevent artifacts from passing to next stage See merge request !7575