[gnome-font-viewer] font-view: destroy error dialog when closed

[Christopher Davis <christopherdavis src gnome org>]

commit c59f3a3fff66cb98785964f63b0e167f33ab2543
Author: Jake Dane <3689-jakedane users noreply gitlab gnome org>
Date:   Thu Aug 4 06:18:06 2022 +0000

    font-view: destroy error dialog when closed
    
    The error dialog couldn't be closed. The cause was that it connected the
    dialog response to gtk_widget_unparent instead of to gtk_window_destroy.
    
    Fixes #45.

 src/font-view.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)
---
diff --git a/src/font-view.c b/src/font-view.c
index adb0540..b22135a 100644
--- a/src/font-view.c
+++ b/src/font-view.c
@@ -723,11 +723,12 @@ font_view_show_error (FontViewApplication *self,
     GtkWidget *dialog;
 
     dialog = gtk_message_dialog_new (GTK_WINDOW (self->main_window),
-                                     GTK_DIALOG_MODAL, GTK_MESSAGE_ERROR,
+                                     GTK_DIALOG_MODAL | GTK_DIALOG_DESTROY_WITH_PARENT,
+                                     GTK_MESSAGE_ERROR,
                                      GTK_BUTTONS_CLOSE, "%s", primary_text);
     gtk_message_dialog_format_secondary_text (GTK_MESSAGE_DIALOG (dialog), "%s",
                                               secondary_text);
-    g_signal_connect (dialog, "response", G_CALLBACK (gtk_widget_unparent),
+    g_signal_connect (dialog, "response", G_CALLBACK (gtk_window_destroy),
                       NULL);
     gtk_widget_show (dialog);
 }