Related: tdf#150007 add destructive-action to file overwrite message dialog

Change-Id: Ic522555a2d9d100a13f1d1dc35cfd6a57675447e
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/144024
Tested-by: Jenkins
Reviewed-by: Adolfo Jayme Barrientos <fitojb@ubuntu.com>
diff --git a/vcl/unx/gtk3/fpicker/SalGtkFilePicker.cxx b/vcl/unx/gtk3/fpicker/SalGtkFilePicker.cxx
index 183ea20..cdb31b3 100644
--- a/vcl/unx/gtk3/fpicker/SalGtkFilePicker.cxx
+++ b/vcl/unx/gtk3/fpicker/SalGtkFilePicker.cxx
@@ -1006,6 +1006,10 @@ sal_Int16 SAL_CALL SalGtkFilePicker::execute()
                                aMsg.getStr()
                            );

                            GtkWidget* pOkButton = gtk_dialog_get_widget_for_response(GTK_DIALOG(dlg), GTK_RESPONSE_YES);
                            GtkStyleContext* pStyleContext = gtk_widget_get_style_context(pOkButton);
                            gtk_style_context_add_class(pStyleContext, "destructive-action");

                            sal_Int32 nSegmentCount = aFileObj.getSegmentCount();
                            if (nSegmentCount >= 2)
                            {