(Only the first 10 of 11 ports in this commit are shown above. )
Update to version 3.9.3
New in this release:
* The TAB address completion in the Compose window now matches any
part of the address and not just the beginning.
* When copying or moving a message, the type-ahead search now matches
any part of a folder name and not just the beginning.
* It is now possible to replace the current signature in the Compose
window by using the '/Message/Replace signature' menu item.
* It is now possible to disable the 'Subject is empty' warning
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