[gnome-boxes/shut-build-warnings: 5/8] assistant: Implicit .begin is deprecated

[Felipe Borges <felipeborges src gnome org>]

commit 84649b014075de09461b2af02175175eca14fffa
Author: Felipe Borges <felipeborges gnome org>
Date:   Wed May 6 11:50:23 2020 +0200

    assistant: Implicit .begin is deprecated

 src/assistant/preparation-page.vala | 2 +-
 src/assistant/vm-assistant.vala     | 8 ++++----
 src/vm-importer.vala                | 2 +-
 3 files changed, 6 insertions(+), 6 deletions(-)
---
diff --git a/src/assistant/preparation-page.vala b/src/assistant/preparation-page.vala
index aa6d426d..2579284a 100644
--- a/src/assistant/preparation-page.vala
+++ b/src/assistant/preparation-page.vala
@@ -34,7 +34,7 @@ public void setup (InstallerMedia media) {
             warning ("Failed to setup installation media '%s': %s", media.device_file, error.message);
         }
 
-        prepare (media);
+        prepare.begin (media);
 
         skip = true;
     }
diff --git a/src/assistant/vm-assistant.vala b/src/assistant/vm-assistant.vala
index f63faee9..24ab18c2 100644
--- a/src/assistant/vm-assistant.vala
+++ b/src/assistant/vm-assistant.vala
@@ -92,8 +92,8 @@ private void go_back () {
     }
 
     [GtkCallback]
-    private void on_next_button_clicked () {
-        visible_page.next ();
+    private async void on_next_button_clicked () {
+        yield visible_page.next ();
     }
 
     [GtkCallback]
@@ -112,14 +112,14 @@ private void do_setup (Object object) {
                                                 next_button, "sensitive",
                                                 BindingFlags.SYNC_CREATE);
 
-        setup_page.setup (vm_creator);
+        setup_page.setup.begin (vm_creator);
     }
 
     [GtkCallback]
     private async void do_review (Object object) {
         pages.set_visible_child (review_page);
 
-        review_page.setup (object as VMCreator);
+        review_page.setup.begin (object as VMCreator);
     }
 
     [GtkCallback]
diff --git a/src/vm-importer.vala b/src/vm-importer.vala
index 5a25f9d0..b5c8c906 100644
--- a/src/vm-importer.vala
+++ b/src/vm-importer.vala
@@ -21,7 +21,7 @@ public override void launch_vm (LibvirtMachine machine, int64 access_last_time =
         machine.config.access_last_time = (access_last_time > 0)? access_last_time : get_real_time ();
 
         if (clone) {
-            import_vm (machine);
+            import_vm.begin (machine);
         } else {
             post_import_setup.begin (machine);
         }