Sorry for the delay, was out sick for a week. This is 'folding by hand' i.e. modify a generated pcell's properties to increase its finger count. Our pcells do internally calculate w-per-finger based on w (i.e. total w) and finger count, but, that w-per-pinger value is never exposed to the user and these pcells are encrypted/compiled by our CAD department so as an end user I can't modify or look at their code. In this use case, the user gives the command to "increase(or decrease) finger count by one". When that operation would result in a w-per-finger that is less than DRC minimums (or is offgrid, for that matter) I would like to give a warning/error back to the user to that effect.
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