Problem with extend_rect

[ppiecuch]

Hello - I have a problem with a code of extend_rect method, I think: it causes second and third Radio to be drawn very large. I have changed the code as below:
void extend_rect(Rect &r)
{
r.sx = std::max(r.sx, /_x + */sx);
r.sy = std::max(r.sy, /_y + */sy);
}
and it is now ok, but I wondering how does it worked before?

Regards
Pawel