Cyrillic "й" is replaced by сyrillic "и" in the anchor link

[v1talii-dev]

Bug report

Enviroment

• vuepress v1.9.9

Steps to reproduce

• Add a heading with lowercase cyrillic letter "й" ## Списки пользователей
• Check generated anchor link. The result should be like this: <h2 id="списки-пользователеи"><a href="#списки-пользователеи" class="header-anchor">#</a> Списки пользователей</h2>

What is expected?

<h2 id="списки-пользователей"><a href="#списки-пользователей" class="header-anchor">#</a> Списки пользователей</h2>

What is actually happening?

Cyrillic "й" is replaced by cyrilliс "и" in the anchor link.

Other relevant information

• Cyrillic "л" is replaced by Latin "n" in the anchor link #1815

[v1talii-dev]

@larionov, what do you think this might be related to?

[larionov]

@v1talii-dev It specifically removes all accents on characters, so it is expected. If we want to keep "й" we would have to make individual custom implementations for different languages. https://github.com/vuejs/vuepress/blob/master/packages/%40vuepress/shared-utils/src/slugify.ts#L12-L13

[v1talii-dev]

@larionov How can this behavior be redefined not only for the first heading level, but also for the second, third?