Row resolution yast icon in alt-tab

Hi,

It has been like this as long as I remember. (I started using openSUSE in 11.1 or so)
When I search for yast in gnome shell activities, yast icon looks fine, but after I run it, when I do alt-tab, the resolution of the yast icon there is very low and so it is ugly. Is this a bug?

Thanks,
Joon