[gnome-control-center] printers: Show file chooser dialog when selecting PPD

[Georges Basile Stavracas Neto <gbsneto src gnome org>]

commit 634d622c7ae91b1e0638270f592cb4c2c0823876
Author: Marek Kasik <mkasik redhat com>
Date:   Fri Feb 4 16:20:43 2022 +0100

    printers: Show file chooser dialog when selecting PPD
    
    A regression from the GTK4 port.

 panels/printers/pp-details-dialog.c | 2 ++
 1 file changed, 2 insertions(+)
---
diff --git a/panels/printers/pp-details-dialog.c b/panels/printers/pp-details-dialog.c
index ece9345f0..5a839cf53 100644
--- a/panels/printers/pp-details-dialog.c
+++ b/panels/printers/pp-details-dialog.c
@@ -275,6 +275,8 @@ select_ppd_manually (PpDetailsDialog *self)
 
   gtk_file_chooser_set_filter (GTK_FILE_CHOOSER (dialog), filter);
 
+  gtk_widget_show (dialog);
+
   g_signal_connect (dialog, "response", G_CALLBACK (ppd_file_select_response_cb), self);
 }