RFR: JDK-8258381 : [macos] Exception when input emoji using Chinese input method

[Kevin Rushforth]

On Sun, 21 Mar 2021 04:13:48 GMT, Hsiafan <github.com+1498664+hsiafan at openjdk.org> wrote:

> The convertNSStringToJString function convert NSString to Java String using NewStringUTF，NewStringUTF accept modified-UTF8 encoded str。This fix using UTF-16 encoding for converting.

I'll review this. The fix seems fine at first glance. With your patch it uses a similar mechanism to the attributed string case; I'm curious why copying the string is needed in that case, but not in this case.

What testing have you done to ensure that this will not cause any regressions?

Perhaps @prrace or @jperedadnr or @johanvos could be a second reviewer?

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PR: https://git.openjdk.java.net/jfx/pull/436