Use minimal suffix that's distinct from local var names #4481
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Overview
Fixes: #4480
When disambiguating suffixified names against local variables, rather than just using the FQN we find the smallest viable suffix. This should JustWork™ on Share too.
Implementation notes
Starting with the suffixified name, keep adding segments until we find a name that doesn't conflict with anything locally defined. 99.9% of the time this'll just be a single segment, but it'll fall back all the way to the FQN if necessary.
Interesting/controversial decisions
Nah
Test coverage
See the updates to the regression test for proof :)