[Backport #17928] Fix bug with obsolete classes and extension methods #17931
+27
−3
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If you recompile a class with extension methods and remove it afterward, then the class stays as obsolete. This happens because of a bug creating duplicated entries in the packages extension maps.
I'm proposing a fix to not add new entries to the extension maps in case of recompilation. Coming with a comment and a regression test.
Fixes #17927