String.lastIndexOf confused by unpaired trailing surrogate

[Martin Buchholz]

For a change, here's an actual plain old "incorrect result" bug fix
for String.lastIndexOf

Sherman, please file a bug and review.

http://cr.openjdk.java.net/~martin/webrevs/openjdk7/lastIndexOf/

Also includes our usual performance-oriented fiddling.

public class LastIndexOf {
    public static void main(String[] args) {
        int ch = 0x10042;
        char[] bug = new char[3];
        Character.toChars(ch, bug, 0);
        bug[2] = bug[0];
        System.out.println(new String(bug).lastIndexOf(ch));
        bug[2] = '!';
        System.out.println(new String(bug).lastIndexOf(ch));
    }
}
==> javac -source 1.6 -Xlint:all LastIndexOf.java
==> java -esa -ea LastIndexOf
-1
0