Backport PR
#2783: Prefilter shouldn't touch execution_count...
Backport PR
#2783: Prefilter shouldn't touch execution_count
Having gone through the various things that can call it, I'm pretty sure that there's no need for prefilter to be modifying the execution/prompt counter. And in testing, I can't construct an example that hits this bit of code.
If we agree on this, it supersedes
#2623.