Fix FileUpload.copy() to prevent title length exceeding 100 chars

[valentijnscholten]

Not sure if we want to keep the copy functionality, but here's a quick fix for Fixes #11314

Problem

When copying a Test with attached files, the copy operation fails with a database error if any file has a title that is 84+ characters long. The error occurs because the FileUpload.copy() method appends - clone-{hash} (17 characters) to the title without checking if it would exceed the database max_length constraint of 100 characters.

Solution

Modified the copy() method in FileUpload to truncate the original title before appending the clone suffix, ensuring the total length never exceeds 100 characters.

Changes

• Calculate the clone suffix length dynamically
• Truncate the original title to ensure total length ≤ 100 characters
• Append the suffix to create a unique title within database constraints

Testing

• Verified the fix handles edge cases where titles are already at or near the limit
• Works correctly even when copying files that were already copied (which may already have clone suffixes)

Error Before Fix

django.db.utils.DataError: value too long for type character varying(100)

After Fix

File titles are properly truncated to fit within the 100 character limit, allowing tests to be copied successfully with all attached files.

[mtesauro]

Approved