Created attachment 6278 How it looks like Alt+Tab dialog previews are scaled poorly. I don't know if it is for performance, but I hope it could be better. See attached screenshots.
Created attachment 6279 How it should look like
This the best scaling that XRender offers. You /could/ achieve the result you expect by using gdkpixbuf but that's way too slow on some hardware.
Note that you can enable gdk pixbuf with a few tweaks in the code. See http://git.xfce.org/xfce/xfwm4/tree/src/icons.c?h=xfce-4.12#n580 and the comment line 595 and 596.
It worked! Great. Maybe it can be a default-disabled option.
Create an option for that may be interesting because I do not know where comment those two lines.
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