Fix missing mail reply address (#27997)

Fixes https://codeberg.org/forgejo/forgejo/issues/1458

Some mails such as issue creation mails are missing the reply-to-comment
address. This PR fixes that and specifies which comment types should get
a reply-possibility.

models/issues/comment.go

@@ -183,6 +183,14 @@ func (t CommentType) HasAttachmentSupport() bool {
 	return false
 }
 
+func (t CommentType) HasMailReplySupport() bool {
+	switch t {
+	case CommentTypeComment, CommentTypeCode, CommentTypeReview, CommentTypeDismissReview, CommentTypeReopen, CommentTypeClose, CommentTypeMergePull, CommentTypeAssignees:
+		return true
+	}
+	return false
+}
+
 // RoleInRepo presents the user's participation in the repo
 type RoleInRepo string
 

services/mailer/mail.go

@@ -290,8 +290,10 @@ func composeIssueCommentMessages(ctx *mailCommentContext, lang string, recipient
 	reference := createReference(ctx.Issue, nil, activities_model.ActionType(0))
 
 	var replyPayload []byte
-	if ctx.Comment != nil && ctx.Comment.Type == issues_model.CommentTypeCode {
+	if ctx.Comment != nil {
+		if ctx.Comment.Type.HasMailReplySupport() {
 			replyPayload, err = incoming_payload.CreateReferencePayload(ctx.Comment)
+		}
 	} else {
 		replyPayload, err = incoming_payload.CreateReferencePayload(ctx.Issue)
 	}
@@ -316,7 +318,7 @@ func composeIssueCommentMessages(ctx *mailCommentContext, lang string, recipient
 		listUnsubscribe := []string{"<" + ctx.Issue.HTMLURL() + ">"}
 
 		if setting.IncomingEmail.Enabled {
-			if ctx.Comment != nil {
+			if replyPayload != nil {
 				token, err := token.CreateToken(token.ReplyHandlerType, recipient, replyPayload)
 				if err != nil {
 					log.Error("CreateToken failed: %v", err)