First moving, then deleting a message in offline mode won't delete the message from the server

Checklist

• I have used the search function to see if someone else has already submitted the same bug report.
• I will describe the problem with as much detail as possible.

App

Thunderbird for Android

App version

8.1

Where did you get the app from?

None

Android version

doesn't matter

Device model

No response

Steps to reproduce

1.Make sure the device isn't able to connect to the incoming mail server, e.g. turn on airplane mode
2. Move a message from folder A to folder B
3. Open folder B
4. Delete the message that was moved there in step 2
5. Restore connectivity and sync the account to make sure pending commands are processed

Expected behavior

After the pending (remote) commands have been processed the message should have been deleted from folder B.

Actual behavior

The message is deleted locally, but not on the server. The app keeps a placeholder message in folder B. So syncing the folder doesn't download the message from the server and locally it appears as if the message is gone. However, the message is still on the server and other clients are able to see it.

This is another instance of the problem we tried to address with the "Cannot copy or move a message that is not synchronised with the server" message. In this case we don't display the message and perform only half of the operation instead. See https://github.com/thunderbird/thunderbird-android/issues/823#issuecomment-2501614162

Logs

No response

Reproduce the sequence in the issue: move a message while offline, delete it in the destination folder, then restore connectivity and sync. Trace the pending remote commands for the move and delete operations; done means the server no longer retains the message and syncing does not leave a placeholder in folder B.