[GITEA] Apply changes to archived labels

This is a squashed result of conflict resolution for the following commits from Gitea:
- 36de5b299b
- 9a93b1816e
- 712e19fa6f
- 83850cc479

It is lacking CSS rule for archived labels, though.

Changes in this commit are authored by:
- 6543
- delvh
- silverwind

models/issues/label.go

@@ -116,12 +116,17 @@ func (l *Label) CalOpenIssues() {
 func (l *Label) SetArchived(isArchived bool) {
 	if !isArchived {
 		l.ArchivedUnix = timeutil.TimeStamp(0)
-	} else if isArchived && l.ArchivedUnix.IsZero() {
+	} else if isArchived && !l.IsArchived() {
 		// Only change the date when it is newly archived.
 		l.ArchivedUnix = timeutil.TimeStampNow()
 	}
 }
 
+// IsArchived returns true if label is an archived
+func (l *Label) IsArchived() bool {
+	return !l.ArchivedUnix.IsZero()
+}
+
 // CalOpenOrgIssues calculates the open issues of a label for a specific repo
 func (l *Label) CalOpenOrgIssues(ctx context.Context, repoID, labelID int64) {
 	counts, _ := CountIssuesByRepo(ctx, &IssuesOptions{
@@ -166,11 +171,6 @@ func (l *Label) BelongsToOrg() bool {
 	return l.OrgID > 0
 }
 
-// IsArchived returns true if label is an archived
-func (l *Label) IsArchived() bool {
-	return l.ArchivedUnix > 0
-}
-
 // BelongsToRepo returns true if label is a repository label
 func (l *Label) BelongsToRepo() bool {
 	return l.RepoID > 0