fix: Allow null passthrough parent #2821
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Description
In
CollisionPassthrough, while searching for an ancestor withCollisionCallbacksmixin,firstWherewas used. This was causing it to fail when no such ancestor was found. But having a passthrough parent is not necessary, at least rest of the code wasn't designed on that assumption. So this PR replacedfirstWherewithfirstWhereOrNullallowing the passthrough to be null.This was discovered in one of the discord discussions.
Checklist
docsand added dartdoc comments with///.examplesordocs.Breaking Change?
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