From 9c23e196440830d0b94ca18bfb1002a0db27b54c Mon Sep 17 00:00:00 2001
From: kolaente <k@knt.li>
Date: Wed, 4 Mar 2026 16:52:56 +0100
Subject: [PATCH] fix: preserve cover image when duplicating task

Track old-to-new attachment ID mapping during duplication and
re-set CoverImageAttachmentID on the new task if the original
had a cover image configured.
---
 pkg/models/task_duplicate.go | 15 +++++++++++++++
 1 file changed, 15 insertions(+)

diff --git a/pkg/models/task_duplicate.go b/pkg/models/task_duplicate.go
index a2b1d8a8d..ea65038e4 100644
--- a/pkg/models/task_duplicate.go
+++ b/pkg/models/task_duplicate.go
@@ -113,7 +113,9 @@ func (td *TaskDuplicate) Create(s *xorm.Session, doer web.Auth) (err error) {
 	if err != nil {
 		return err
 	}
+	oldToNewAttachmentIDs := make(map[int64]int64)
 	for _, attachment := range attachments {
+		oldAttachmentID := attachment.ID
 		attachment.ID = 0
 		attachment.TaskID = newTask.ID
 		attachment.File = &files.File{ID: attachment.FileID}
@@ -133,6 +135,19 @@ func (td *TaskDuplicate) Create(s *xorm.Session, doer web.Auth) (err error) {
 		if err != nil {
 			return err
 		}
+		oldToNewAttachmentIDs[oldAttachmentID] = attachment.ID
+	}
+
+	// Re-set the cover image if the original task had one
+	if originalTask.CoverImageAttachmentID != 0 {
+		if newAttachmentID, ok := oldToNewAttachmentIDs[originalTask.CoverImageAttachmentID]; ok {
+			newTask.CoverImageAttachmentID = newAttachmentID
+			if _, err := s.Where("id = ?", newTask.ID).
+				Cols("cover_image_attachment_id").
+				Update(newTask); err != nil {
+				return err
+			}
+		}
 	}
 
 	// Create "copied from/to" relation