[Bug] Referencing to an unexists issue

[renbaoshuo]

Description

When the referenced issue does not exist, Gitea will still give a link to the non-existing issue.

Demo: https://try.gitea.io/baoshuo/issue-ref/commits/branch/main

Neither GitHub nor GitLab have this bug.

Gitea Version

1.18.0+dev-58-g9d9bf66c3

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?

https://try.gitea.io/

Database

No response

[renbaoshuo]

gitea/modules/markup/html.go

Lines 798 to 805 in 9d9bf66

	if matchOrg == ctx.Metas["user"] && matchRepo == ctx.Metas["repo"] {
	// TODO if m[4]:m[5] is not nil, then link is to a comment,
	// and we should indicate that in the text somehow
	replaceContent(node, m[0], m[1], createLink(link, id, "ref-issue"))
	} else {
	orgRepoID := matchOrg + "/" + matchRepo + id
	replaceContent(node, m[0], m[1], createLink(link, orgRepoID, "ref-issue"))
	}

I think there should check if the referenced issue exists.

[lunny]

Depends on #29222