[geary/wip/522-mailto-broken] Add HANDLES_OPEN flag to GearyApplication

[Michael Gratton <mjog src gnome org>]

commit c0b9aaf811295ab991ab2191fb9430b9e7256888
Author: Michael Gratton <mike vee net>
Date:   Thu Aug 29 23:31:50 2019 +1000

    Add HANDLES_OPEN flag to GearyApplication
    
    Fixes Geary not working as a mailto: handler due to the GAppplication
    DBus implementation not passing on the open action if not set.
    
    See GNOME/glib#1853
    
    Fixes #522

 src/client/application/geary-application.vala | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)
---
diff --git a/src/client/application/geary-application.vala b/src/client/application/geary-application.vala
index 77307393..078241e9 100644
--- a/src/client/application/geary-application.vala
+++ b/src/client/application/geary-application.vala
@@ -363,7 +363,10 @@ public class GearyApplication : Gtk.Application {
     public GearyApplication() {
         Object(
             application_id: APP_ID,
-            flags: GLib.ApplicationFlags.HANDLES_COMMAND_LINE
+            flags: (
+                GLib.ApplicationFlags.HANDLES_OPEN |
+                GLib.ApplicationFlags.HANDLES_COMMAND_LINE
+            )
         );
         this.add_main_option_entries(OPTION_ENTRIES);
         _instance = this;