20h did the first pie menu patch that is available on sources as a
real patch so the credit goes to him:

/n/sources/patch/sorry/piemenus-rio

used this for a long time but hidden window items cause the position
of the static items to change destroying the benefit of pie menus
where you can remember the direction of the action and then use it
blindly without scanning the pie.

what i did was write my own piemenu implementation using another
packing algo and adding sub menus to separate the dynamic
items.

/n/sources/contrib/cinap_lenrek/pierio

didnt release it as a patch because i did some other modifications
to rio like focus follows mouse and window cycling by keyboard
so that dir above contains all of this.

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cinap