[mutter] backend: Use connect-after to perform actions on device removed

[Robert Mader <rmader src gnome org>]

commit 5730b998fd98887df93553237b639d63357a9871
Author: Marco Trevisan (Treviño) <mail 3v1n0 net>
Date:   Wed Jul 15 17:52:37 2020 +0200

    backend: Use connect-after to perform actions on device removed
    
    When a device is removed we perform some actions such as stopping the
    "::last-device-changed" signal emission and unsetting the current device.
    And we want to be sure that these actions happen after all the
    device-removed operations are sorted out.
    
    Related to: https://gitlab.gnome.org/GNOME/mutter/-/issues/1345
    https://gitlab.gnome.org/GNOME/mutter/-/merge_requests/1371

 src/backends/meta-backend.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)
---
diff --git a/src/backends/meta-backend.c b/src/backends/meta-backend.c
index 115fba505e..70549fa1ac 100644
--- a/src/backends/meta-backend.c
+++ b/src/backends/meta-backend.c
@@ -530,7 +530,8 @@ meta_backend_real_post_init (MetaBackend *backend)
   g_signal_connect_object (seat, "device-added",
                            G_CALLBACK (on_device_added), backend, 0);
   g_signal_connect_object (seat, "device-removed",
-                           G_CALLBACK (on_device_removed), backend, 0);
+                           G_CALLBACK (on_device_removed), backend,
+                           G_CONNECT_AFTER);
 
   set_initial_pointer_visibility (backend, seat);