[MlMt] Move beetween eMails: Folder should also move subfolders

[Michael Nietzold]

Summary:

- Move beetween eMails: Folder should also move subfolders

where:

- i have 2 eMail Accounts
- i have a IMAP Mailbox with many subfolders on many levels
- i drag the parent node of this subfolders to the second eMail Account


what i see:

- eMails in the parent node are moved to the new eMail
- sometimes the parent node looses the icon or some text from the title
- the subfolders still on eMail1
- in eMail2 i miss the subfolders
- i have to manually select each folder to move to eMail2


what i expected:

- all subfolders of the parent IMAP mailbox should be moved to the eMail 2
- the order and the levels should be the same as in eMail 1
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