This is useful whenever one has a need to manually tweak the trim operation.
Simply run:
apitrace trim --print-callset --frames=<whatever> --calls=<whatever>
as desired. Then take the resulting callset that is printed and run:
apitrace trim --calls=<callset> --exact
This should yield an identical trimming operation. Then this operation
can be tweaked by appending call ranges to the --calls option,
deleting rangess from the --calls option, or by appending a new
--frames option.