Fix buttons offset to the right when dialog is at minsize

[timothyqiu]

The command palette window at its minsize:

Before	After

When determining window minimum width, panel padding should be applied after max(buttons_width, child_width).

godot/scene/gui/dialogs.cpp

Lines 223 to 227 in 2543d19

	Size2 buttons_minsize = buttons_hbox->get_combined_minimum_size();
	Size2 buttons_size = Size2(dlg_size.x - h_margins, buttons_minsize.y);
	Point2 buttons_position = Point2(theme_cache.panel_style->get_margin(SIDE_LEFT), dlg_size.y - theme_cache.panel_style->get_margin(SIDE_BOTTOM) - buttons_size.y);
	buttons_hbox->set_position(buttons_position);
	buttons_hbox->set_size(buttons_size);

[kleonc]

Makes sense!

[akien-mga]

Thanks!