Replacement of underscores with dashes in auto-generated IDs for titles in markdown doesn't match Github

[AnneLaureF]

• Gitea version (or commit ref): 1.12.1
• Git version: 2.20.1
• Operating system: Debian 10
• Database (use [x]):
  • PostgreSQL
  • MySQL
  • MSSQL
  • SQLite
• Can you reproduce the bug at https://try.gitea.io:
  • Yes (provide example URL) https://try.gitea.io/annelauref/underscore
  • No
  • Not relevant
• Log gist:

Description

In Markdown files, during the generation of the IDs for titles Gitea replaces underscore ( _ ) with dashes ( - ).
Github doesn't do that.
The impact is that links will be broken for repos with remotes on both Gitea and Github (or mirrors).

Screenshots

on gitea:

on github:

[stale]

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