Some markdown links aren't rendered correctly

[qwerty287]

Gitea Version

1.16.0

Operating System

No response

Browser Version

Firefox 94.0

Can you reproduce the bug on the Gitea demo site?

Yes

Description

Some links aren't rendered correctly by the md parser.

1. compare links are rendered like a link to a single commit, but the chars ...<second commit sha> is coming after this text.
2. if I link to a permanent code snippet and add a single char after the link, the char is included in the rendered link (and in the link the href param is wrong too)

For an example on try with all issues: https://try.gitea.io/ktdkydkycoyf/ex/issues/2#issuecomment-112142

Screenshots

Examples:

1. see https://codeberg.org/gitnex/GitNex/pulls/1008#issue-77442 - the fifth list point contains a compare link
2. see https://codeberg.org/gitnex/GitNex/pulls/1014 (there is only one link in this comment, a permanent lines link with a trailing :

[wxiaoguang]

Can you prepare some simple reproducible samples on try.gitea.io? Then we can try to find some ways to fix it.

If you already have ideas about how to fix it, please advise 😊

[qwerty287]

Not a repro step, but you can find this comment which summarizes the issues: https://try.gitea.io/ktdkydkycoyf/ex/issues/2#issuecomment-112142
The raw md content is in the code block below the actual comment content

[wxiaoguang]

I proposed a fix:

• Fix markdown URL parsing #17924