RFR: 8302590: Add String.indexOf(int ch, int fromIndex, int toIndex)

[Raffaello Giulietti]

On Fri, 24 Feb 2023 16:27:10 GMT, Viktor Klang <duke at openjdk.org> wrote:

>> This is the behavior of the underlying implementation as well.
>
> Personally I would expect `string.substring(fromIndex, toIndex).indexOf(ch)` to behave isomorphically to `string.indexOf(ch, fromIndex, toIndex)`

Then you would also expect `string.substring(fromIndex).indexOf(ch)` to behave isomorphically to `string.indexOf(ch, fromIndex)` in current releases, right?
It does not.

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PR: https://git.openjdk.org/jdk/pull/12600