Add widgets/spacing to dialog vertical layout

def add_widgets(self, *widgets_or_spacings):
        """Add widgets/spacing to dialog vertical layout"""
        layout = self.layout()
        for widget_or_spacing in widgets_or_spacings:
            if isinstance(widget_or_spacing, int):
                layout.addSpacing(widget_or_spacing)
            else:
                layout.addWidget(widget_or_spacing)