[Issue 23341] [std.uni] ZWJ not handled properly

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=23341

--- Comment #1 from Garrett D'Amore <garrett at damore.org> ---
ZWJ probably requires a level of sophistication to handle properly:

https://en.wikipedia.org/wiki/Zero-width_joiner

For example, the handling in Devangari is a little different since ZWJ modifies
characters placed before it.

For example:

    s2 = "\u0915\u094d\u200d";
        writefln("s2 is %s\n", s2);
    writefln("graphemes %d (expect 1)\n", wr.walkLength); // this should be "1"

This looks like: क्‍

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