[ApiCompat] Warn if abstract keyword is removed from member #46797
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Fixes #46794
Removing the
abstract
keyword from a member should be disallowed by ApiCompat, but it currently does not know how to handle that case like it used to in the old version.The lack of warning in ApiCompat caused the introduction of this bug in maintenance-packages
System.Reflection.DispatchProxy
: dotnet/maintenance-packages#194 which we fixed with dotnet/maintenance-packages#202