How reproducible:
Launch first launch wizard, when entering server/port, enter data of a server that won't reply, like imap.gmail.com with port 143. Then click "Check for supported types" in Authentication Type.

Actual results
Pressing the cancel button doesn't cancel the query. Instead it waits for some timeout. Trying to close Evolution when it tries to download messages from a such nonexistent server makes all the controls inactive, but it still waits for that timeout.

Expected results:
Pressing the cancel button cancels the query.