Current stgit asks SMTP password for every patch

Hello, Alex!

I was unpleasantly surprised when the current STGit started asking me for the SMTP password for every patch in the series:

$ stg mail --to minicom ncurses-const..clobber Checking the validity of the patches ... done Sending patch "ncurses-const" ... Please enter SMTP password: done Sending patch "precision-int" ... Please enter SMTP password: done Sending patch "aliasing" ... Please enter SMTP password: done Sending patch "clobber" ... Please enter SMTP password: done

The code in __send_message_smtp() lacks any caching for the smtppassword variable. The code comes from your commit 89d7ec43e0b25cc6cbc9feb044d7ce7048f224eb stg mail: Refactor __send_message and friends

Ideally, asking for the password (as well as other verification of the e-mail credentials) should be done before "Sending patch" is shown, and before the cover letter if any. That is, it should be in func() in stgit/commands/mail.py.

But I'll also be fine with a simple-minded password caching in __send_message_smtp().