tdf#116074: Don't block on sending email interactively

When sending e-mail using a MAPI mail client that doesn't recognize
MAPI_DIALOG_MODELESS flag, and doesn't return from MAPISendMail until
message compose dialog is closed (like MS Outlook 2010 and older),
waiting for the senddoc process blocks UI, which is unexpected and
prevents users from copying stuff from documents to the mail body.

Waiting for senddoc process completion is used for two things:
1. To serialize sending multiple mails (e.g., using mailmerge);
2. To show error in case when it failed.

This patch allows to avoid blocking the UI in case when compose UI is
requested - i.e., user interaction with the mail client is expected,
and serialization is not required. In this case, the senddoc process
will show the error message itself -> no need for main application to
wait for its return. The error message now includes actual error code.

To avoid cases when closing main program would remove temporary
attachment files before they were used by mail client, they are
copied to base temporary directory (instead of default session
temporary directory that gets deleted upon program shutdown).
senddoc cleans up its temporaries itself.

The temporary attachment files are copied to files with ASCII-only
filenames, and their original filenames are passed to mail clients
using MAPI. This allows to avoid cases when the filenames contain
characters outside of current Windows codepage, and the mail client
does not support Unicode MAPI, thus receiving wrong filename and
erroring out from the send.

Change-Id: I4a517bd7a797e76e4c0b7ea48bb1a7b652741a81
Reviewed-on: https://gerrit.libreoffice.org/50826
Tested-by: Jenkins <ci@libreoffice.org>
Reviewed-by: Mike Kaganski <mike.kaganski@collabora.com>

0 files changed, 0 insertions, 0 deletions