Keep attachments on tasklist update (#16750)

* Send attachments too.

* Use tasklist flag.

* use action="ignoreAttachments" instead of "tasklist"

* Use boolean parameter.

Co-authored-by: zeripath <art27@cantab.net>

routers/web/repo/issue.go

@@ -2127,13 +2127,6 @@ func UpdateCommentContent(ctx *context.Context) {
 		return
 	}
 
-	if comment.Type == models.CommentTypeComment {
-		if err := comment.LoadAttachments(); err != nil {
-			ctx.ServerError("LoadAttachments", err)
-			return
-		}
-	}
-
 	if !ctx.IsSigned || (ctx.User.ID != comment.PosterID && !ctx.Repo.CanWriteIssuesOrPulls(comment.Issue.IsPull)) {
 		ctx.Error(http.StatusForbidden)
 		return
@@ -2155,6 +2148,17 @@ func UpdateCommentContent(ctx *context.Context) {
 		return
 	}
 
+	if ctx.FormBool("ignore_attachments") {
+		return
+	}
+
+	if comment.Type == models.CommentTypeComment {
+		if err := comment.LoadAttachments(); err != nil {
+			ctx.ServerError("LoadAttachments", err)
+			return
+		}
+	}
+
 	if err := updateAttachments(comment, ctx.FormStrings("files[]")); err != nil {
 		ctx.ServerError("UpdateAttachments", err)
 		return