DescriptionProtect a few events from gc.
Some may not be related to obscure errors we see, but as far as I can tell,
events don't have built-in protection when sticking around after their
time. I have really no clue how grobs are protected from collection, but
since they do not seem to get extra treatment elsewhere, I hope they'll
be fine until output time.
Patch Set 1 #Patch Set 2 : Try clearing out unterminated slurs. #
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