RFR: 8356165: System.in in jshell replace supplementary characters with ?? [v3]

[Jan Lahoda]

On Mon, 12 May 2025 22:54:30 GMT, Tatsunori Uchino <duke at openjdk.org> wrote:

> I forgot to explain the context:
> 
>     * Increment of the number of input bytes to be read is to assure that a byte or code unit is not read twice or skipped
> 
>     * Providing extra input is to prevent  the suspension due to the input starvation (especially for builds without this fix)

I missed the additional `1` there. But, I think the current code, although more complex, satisfies the constraints as well (we are reading the end-of-line, and checking for it).

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PR Comment: https://git.openjdk.org/jdk/pull/25079#issuecomment-2876199815