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Each constructor of the SourceMapper creates its own filenameFilter. They could be reused, because they are immutable. So only one filenameFilter could be shared among all source mappers.
Not critical
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Define a new constant FileNameFilter and use it in each constructor. This prevents from creating unnecessary instances of filename filters.
Backported to 2.1 maintenance stream.
Fixed in 2.2 stream as well.
Verified.
Verified for 3.0M1.