deinit

pub fn deinit(self: *VirtualParentWidget) void {
    defer if (dvui.widgetIsAllocated(self)) dvui.widgetFree(self);
    defer self.* = undefined;
    if (self.child_rect_union) |u| {
        dvui.dataSet(null, self.data().id, "_rect", u);
    }
    dvui.parentReset(self.data().id, self.data().parent);
}