Text looks blur in editor mode when use Canvas Scaler

Hi,

I found a problem when using new unity UI:

When I use Canvas Scaler component on Canvas (Screen - Space Camera) and set Scale with Screen Size settings, I found that the text in Scene view window will be blurred. (This only happens in editor mode.)

It is worth to note that if I make Game View window larger, the text will be clearer than before.

Is this a Unity bug? I there any solution to fix?

Very thanks.

My unity version is 4.6.3f1

Screenshot 1:


Screenshot 2: (make Game View window larger)