Deleting a version silently deletes its attachments
Deleting a version which has one or more attachments unexpectedly succeeds if no issues are associated with the version.
You can reproduce the problem with the following steps:
1. Create a new version
2. Open the "Files" tab in the project menu
3. Attach a file to the version
4. Delete the version. Attached files are deleted along with the version without warning
I think Redmine should not allow deleting a version with attachments.