[gtk] dialog: Remove useless gtk_widget_show() call

[Timm Bäder <baedert src gnome org>]

commit 5d8c8f33c07465cab00f0b2daf9f102ab1defdbc
Author: Timm Bäder <mail baedert org>
Date:   Sun Sep 22 10:18:06 2019 +0200

    dialog: Remove useless gtk_widget_show() call

 gtk/gtkdialog.c | 2 --
 1 file changed, 2 deletions(-)
---
diff --git a/gtk/gtkdialog.c b/gtk/gtkdialog.c
index f064cb5d40..6a6a03ecbd 100644
--- a/gtk/gtkdialog.c
+++ b/gtk/gtkdialog.c
@@ -901,8 +901,6 @@ gtk_dialog_add_button (GtkDialog   *dialog,
   button = gtk_button_new_with_label (button_text);
   gtk_button_set_use_underline (GTK_BUTTON (button), TRUE);
 
-  gtk_widget_show (button);
-
   gtk_dialog_add_action_widget (dialog, button, response_id);
 
   return button;