RFR: 8140241: (fc) Data transfer from FileChannel to itself causes hang in case of overlap

[Alan Bateman]

On Tue, 10 Aug 2021 17:14:57 GMT, Brian Burkhalter <bpb at openjdk.org> wrote:

> As an aside, I think that the cast to `int` at line 689 of `FileChannelImpl` should have been removed in the fix for [JDK-8271308](https://bugs.openjdk.java.net/browse/JDK-8271308) but was not.

Including it as part of this change should be okay.

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PR: https://git.openjdk.java.net/jdk/pull/5061