[Bug]: Children of split transactions cannot be marked as one side of a transfer

[dbendelman]

Verified issue does not already exist?

• I have searched and found no existing issue
• I will be providing steps how to reproduce the bug (in most cases this will also mean uploading a demo budget file)

What happened?

Steps to reproduce

1. Create transaction A for -$100 in account 1, and transaction B for $50 in account 2.
2. Split transaction A into 2 -$50 child transactions.
3. Select a child of transaction A and the unsplit transaction B, and in the pulldown, try to mark these as a transfer.

Expected: It works.
Actual: The "Make transfer" option is greyed out.

Interesting observation

If I select a child of transaction A in account 1, click to change its Payee, click the "Make transfer" button and select account 2, it mostly works: the child transaction is indeed marked as a transfer and a sister transaction is created in account 2. This seems to suggest that the underlying functionality works, it's probably just an issue in the logic that enables/disables that "Make transfer" option in the dropdown. Unfortunately, this workaround isn't ideal because it only covers cases where I want to create a sister transaction in account 2, but there's still no way to mark an existing transaction in account 2 as a transfer with a child of a split.

Where are you hosting Actual?

Docker

What browsers are you seeing the problem on?

Chrome, Desktop App (Electron)

Operating System

Linux