[gnome-sudoku/arnaudb/wip/gtk4: 41/47] Adapt to Dialog API.

[Arnaud B. <arnaudb src gnome org>]

commit 388a9568cfe92960fc90d92b67fe54bd2d50acb4
Author: Arnaud Bonatti <arnaud bonatti gmail com>
Date:   Wed Aug 5 19:29:19 2020 +0200

    Adapt to Dialog API.

 src/gnome-sudoku.vala   | 9 +++++----
 src/sudoku-printer.vala | 2 +-
 2 files changed, 6 insertions(+), 5 deletions(-)
---
diff --git a/src/gnome-sudoku.vala b/src/gnome-sudoku.vala
index 6eb11fd..ac22c09 100644
--- a/src/gnome-sudoku.vala
+++ b/src/gnome-sudoku.vala
@@ -301,8 +301,7 @@ public class Sudoku : Gtk.Application
             var error_str = "%s\n%s".printf(_("The puzzle you have entered is not a valid Sudoku."), 
_("Please enter a valid puzzle."));
             var dialog = new MessageDialog (window, DialogFlags.MODAL, MessageType.ERROR, ButtonsType.OK, 
error_str);
 
-            dialog.run ();
-            dialog.destroy ();
+            dialog.present ();
         }
         else
         {
@@ -593,11 +592,13 @@ public class Sudoku : Gtk.Application
         print_action.set_enabled (false);
         print_multiple_action.set_enabled (false);
         var print_dialog = new PrintDialog (saver, window);
-        print_dialog.destroy.connect (() => {
+        print_dialog.close_request.connect (() => {
             this.print_action.set_enabled (main_stack.get_visible_child_name () == "frame");
             this.print_multiple_action.set_enabled (true);
+
+            return /* do your usual stuff */ false;
         });
-        print_dialog.run ();
+        print_dialog.present ();
     }
 
     private void help_cb ()
diff --git a/src/sudoku-printer.vala b/src/sudoku-printer.vala
index 7b5fcbf..7795ef4 100644
--- a/src/sudoku-printer.vala
+++ b/src/sudoku-printer.vala
@@ -44,7 +44,7 @@ public class SudokuPrinter : GLib.Object {
             new MessageDialog (window, DialogFlags.MODAL,
                                MessageType.ERROR, ButtonsType.CLOSE,
                                /* Error message if printing fails */
-                               "%s\n%s".printf (_("Error printing file:"), e.message)).run ();
+                               "%s\n%s".printf (_("Error printing file:"), e.message)).present ();
         }
 
         return PrintOperationResult.ERROR;