RFR: 8357286: (bf) Remove obsolete instanceof checks in CharBuffer.append [v2]

[Brian Burkhalter]

On Wed, 11 Jun 2025 15:29:27 GMT, Brian Burkhalter <bpb at openjdk.org> wrote:

>> src/java.base/share/classes/java/nio/Heap-X-Buffer.java.template line 297:
>> 
>>> 295:         checkSession();
>>> 296: 
>>> 297:         Objects.checkFromToIndex(start, end, csq.length());
>> 
>> The append(CharSequence) methods are specified to append "null" when the CharSequence is null so append(null, 0, 0) will need to be handled here.
>
> Based on code inspection, it looks like that error might have already been possible but did not turn up before.

Fixed in cda92b2.

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PR Review Comment: https://git.openjdk.org/jdk/pull/25739#discussion_r2141216896