analog to :{buf,arg,win,tab}do for quickfix?

I've got some results from a :vimgrep in a quickfix window and would
like to perform Ex operations across them, something like (imagined)

:vimgrep /\s\+$/ lots*of*files.py
:cdo s/\s\+$//|w "if it iterates by quickfix lines

or

:cdo %s/\s\+$//|w "if it iterates by quickfix files


I can hack my way around it for now with some macros, but this is the
2nd or 3rd time recently that I've reached for this sort of
functionality and shrugged. So I figured it was at least worth
asking if anybody had suggestions.

-tim





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