D9972: SMTP: fix truncated attachment if it contains a line with a single dot

[David Faure]

dfaure created this revision.
dfaure added a reviewer: dvratil.
Restricted Application added a project: KDE PIM.
Restricted Application added a subscriber: KDE PIM.
dfaure requested review of this revision.

REVISION SUMMARY
  In SMTP speak, a line with a single dot means end of message. So if
  we're attaching a text file that contains such a line, we need to
  "escape" it by making it two dots, as the spec says.
  No unescaping code needed, the SMTP server takes care of it.

TEST PLAN
  Sending a text file that starts with ".\n" used to send
  an empty file, now it works, I get the full file, intact.

REPOSITORY
  R733 KSmtp

BRANCH
  Applications/17.12

REVISION DETAIL
  https://phabricator.kde.org/D9972

AFFECTED FILES
  src/sendjob.cpp

To: dfaure, dvratil
Cc: mlaurent, olivierjg, #kde_pim, dvasin, winterz, vkrause, knauss, dvratil
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