EShellBackend: Respond to EShell::prepare-for-quit signals.

Listen for "prepare-for-quit" signals from the shell and inhibit
shutdown until all the activities we're tracking are finalized.

Also, add a couple supporting functions:

  gboolean  e_shell_backend_is_busy     (EShellBackend *shell_backend);
  void      e_shell_backend_cancel_all  (EShellBackend *shell_backend);

These will eventually replace mail_msg_active() and mail_cancel_all().

1 files changed, 14 insertions, 0 deletions

diff --git a/modules/mail/e-mail-shell-view-actions.c b/modules/mail/e-mail-shell-view-actions.c
index 852edbd147..3c4871bffe 100644
--- a/modules/mail/e-mail-shell-view-actions.c
+++ b/modules/mail/e-mail-shell-view-actions.c
@@ -830,7 +830,21 @@ static void
 action_mail_stop_cb (GtkAction *action,
                      EMailShellView *mail_shell_view)
 {
+	EShellView *shell_view;
+	EShellBackend *shell_backend;
+
+	shell_view = E_SHELL_VIEW (mail_shell_view);
+	shell_backend = e_shell_view_get_shell_backend (shell_view);
+
+	/* XXX There's some overlap here: activities submitted through
+	 *     the legacy MailMsg system might be cancelled twice, but
+	 *     it shouldn't cause problems. */
+
+	/* the old way */
 	mail_cancel_all ();
+
+	/* the new way */
+	e_shell_backend_cancel_all (shell_backend);
 }
 
 static void