[four-in-a-row/arnaudb/wip/gtk4] Give focus to view after hint.

[Arnaud B. <arnaudb src gnome org>]

commit 854ecfe1c899c9b382e9a3c4f4872eea85a1978f
Author: Arnaud Bonatti <arnaud bonatti gmail com>
Date:   Mon Apr 27 19:59:07 2020 +0200

    Give focus to view after hint.

 src/four-in-a-row.vala | 2 ++
 1 file changed, 2 insertions(+)
---
diff --git a/src/four-in-a-row.vala b/src/four-in-a-row.vala
index 3a6495b..00cfafe 100644
--- a/src/four-in-a-row.vala
+++ b/src/four-in-a-row.vala
@@ -921,6 +921,8 @@ private class FourInARow : Gtk.Application
             window.allow_undo (false);
         else
             window.allow_undo (true);
+
+        game_board_view.grab_focus ();
     }
 
     private inline void on_game_undo ()