Introduce SetterSpecificity.FromUnknown to avoid misuse of FromHandler #30122
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Description of Change
Adds a new
SetterSpecificity.FromUnknown
for cases where a value needs to be applied with higher priority but should still be overridable by everything else, includingFromHandler
.This addresses current misuse of
SetterSpecificity.FromHandler
in scenarios that are not actually coming from the platform/handler.These usages are not handler-driven updates. Overloading FromHandler here undermines its intent and blocks necessary changes (like in #29970) to prevent round-trips in handler-property mappings.
Issues Fixed
Contributes to #29970
Contributes to #22585