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Add alert blocks in markdown (#29121)

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- Follows https://github.com/go-gitea/gitea/pull/21711
- Closes https://github.com/go-gitea/gitea/issues/28316

Implement GitHub's alert blocks markdown feature

Docs:
-
https://docs.github.com/en/get-started/writing-on-github/getting-started-with-writing-and-formatting-on-github/basic-writing-and-formatting-syntax#alerts
- https://github.com/orgs/community/discussions/16925

### Before

![image](14f7b02a-5de5-4fd0-8437-a055dadb31f2)

### After

![image](ed06a869-e545-42f1-bf25-4ba20b1be196)

## ⚠️ BREAKING ⚠️

The old syntax no longer works

How to migrate:

If you used
```md
> **Note** My note
```

Switch to
```md
> [!NOTE]
> My note
```

---------

Signed-off-by: Yarden Shoham <git@yardenshoham.com>
Co-authored-by: silverwind <me@silverwind.io>
Co-authored-by: Giteabot <teabot@gitea.io>
This commit is contained in:
Yarden Shoham 2024-02-10 20:43:09 +02:00 • committed by Gergely Nagy
parent 2fb3ecc6e3
commit 0b3193bbbe
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4 changed files with 97 additions and 31 deletions
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5
modules/markup/sanitizer.go
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@ -64,9 +64,10 @@ func createDefaultPolicy() *bluemonday.Policy {
policy.AllowAttrs("class").Matching(regexp.MustCompile(`^color-preview$`)).OnElements("span")
// For attention
policy.AllowAttrs("class").Matching(regexp.MustCompile(`^gt-py-3 attention attention-\w+$`)).OnElements("blockquote")
policy.AllowAttrs("class").Matching(regexp.MustCompile(`^attention-\w+$`)).OnElements("strong")
policy.AllowAttrs("class").Matching(regexp.MustCompile(`^attention-icon attention-\w+$`)).OnElements("span", "strong")
policy.AllowAttrs("class").Matching(regexp.MustCompile(`^svg octicon-\w+$`)).OnElements("svg")
policy.AllowAttrs("class").Matching(regexp.MustCompile(`^gt-mr-2 gt-vm attention-\w+$`)).OnElements("span", "strong")
policy.AllowAttrs("class").Matching(regexp.MustCompile(`^svg octicon-(\w|-)+$`)).OnElements("svg")
policy.AllowAttrs("viewBox", "width", "height", "aria-hidden").OnElements("svg")
policy.AllowAttrs("fill-rule", "d").OnElements("path")