Don't allow editing mails in the outbox while sending is in progress.
Don't allow editing mails in the outbox while sending is in progress.

svn path=/trunk/kdenetwork/kmail/; revision=175554

lefou/kdepim-noakonadi,lefou/kdepim-noakonadi,lefou/kdepim-noakonadi,lefou/kdepim-noakonadi,lefou/kdepim-noakonadi,lefou/kdepim-noakonadi