[geary/wip/775956-dbus-activation] Don't auto-show the main window when started as a service

[Michael Gratton <mjog src gnome org>]

commit 719568a092a4699c7cc2d86fd5cad54a20f24525
Author: Michael Gratton <mike vee net>
Date:   Wed Apr 10 00:50:16 2019 +1000

    Don't auto-show the main window when started as a service

 src/client/application/geary-controller.vala | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)
---
diff --git a/src/client/application/geary-controller.vala b/src/client/application/geary-controller.vala
index 93eb48f8..06bc4e4a 100644
--- a/src/client/application/geary-controller.vala
+++ b/src/client/application/geary-controller.vala
@@ -1059,7 +1059,8 @@ public class GearyController : Geary.BaseObject {
     private void display_main_window_if_ready() {
         if (did_attempt_open_all_accounts() &&
             !upgrade_dialog.visible &&
-            !cancellable_open_account.is_cancelled())
+            !cancellable_open_account.is_cancelled() &&
+            !this.application.is_background_service)
             main_window.show();
     }