Markdown relative links / not working properly

[mg-cloud]

Description

I stumble upon a rendering issue with markdown relative links. I didn't find any specification for this so I'm referring to GitHub documentation which states "Links starting with / will be relative to the repository root."
However in Gitea, the are relative to gitea root url.
For example:

[Link to ../test.md] (../test.md) -> Working (links to https://try.gitea.io/myrepo/src/branch/master/test.md)
[Link to /test.md] (/test.md) -> Not working (links to https://try.gitea.io/test.md)

I reproduce the issue on try.gitea.io, see https://try.gitea.io/mgalloux/test-markdown
In the README, you have a basic relative link (../test.md) which works as expected, but the syntax (/test.md) links to the ROOT_URL/test.md and returns a 404.

Gitea Version

1.20.0

Can you reproduce the bug on the Gitea demo site?

Yes

Log Gist

No response

Screenshots

Git Version

No response

Operating System

No response

How are you running Gitea?

Discovered the issue on my docker instance with Gitea 1.20.0 but was able to reproduce it on try.gitea.io 1.22.0+dev-188-g1be49fddae

Database

None

[mg-cloud]

Closing as duplicate of #18592