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Limit the length of generated anchor URL for markdown headers

Vasilii Iakliushin requested to merge 204808_limit_anchor_href_length into master

What does this MR do and why?

Contributes to #204808

Problem

There is no limitation for generated header anchors. It might cause performance problems for long headers processing.

More details: https://gitlab.com/gitlab-org/gitlab/-/issues/204808#note_814064215

Solution

Limit anchor link length with 255 characters.

How to set up and validate locally

  1. Download snippet from https://gitlab.com/gitlab-org/gitlab/-/issues/204808#summary
  2. Go to new snippet page (http://127.0.0.1:3000/-/snippets/new)
  3. Paste snippet content and set filename to test.md
  4. Save snippet form
  5. Verify that the snippet was successfully created and accessible for a view

MR acceptance checklist

This checklist encourages us to confirm any changes have been analyzed to reduce risks in quality, performance, reliability, security, and maintainability.

Edited by Vasilii Iakliushin

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