markup: use default link formation when no format in metas (#6723)

CHANGELOG.md

@@ -21,8 +21,8 @@ All notable changes to Gogs are documented in this file.
 ### Fixed
 
 - Add `X-Frame-Options` header to prevent Clickjacking. [#6409](https://github.com/gogs/gogs/issues/6409)
-- [Security] Potential SSRF attack by CRLF injection via repository migration. [#6413](https://github.com/gogs/gogs/issues/6413)
-
+- _Regression:_ Fixed smart links for issues stops rendering. [#6506](https://github.com/gogs/gogs/issues/6506)
+- _Security:_ Potential SSRF attack by CRLF injection via repository migration. [#6413](https://github.com/gogs/gogs/issues/6413)
 
 ### Removed
 

internal/markup/markup.go

@@ -101,7 +101,7 @@ func RenderIssueIndexPattern(rawBytes []byte, urlPrefix string, metas map[string
 			m = m[1:]
 		}
 		var link string
-		if metas == nil {
+		if metas == nil || metas["format"] == "" {
 			link = fmt.Sprintf(`<a href="%s/issues/%s">%s</a>`, urlPrefix, m[1:], m)
 		} else {
 			// Support for external issue tracker