String.reverse works incorrectly for strings with combining diaeresis

[alech]

While looking at the Elixir Getting Started guide, I stumbled upon this interesting blog post called The string type is broken. One example is reversing the String "noël", which should result in "lëon". Unfortunately, elm 0.17.1 fails this test, putting the diaresis over the l instead of over the e:

s = "noe\x0308l"
"noël" : String
String.reverse s
"l̈eon" : String

[process-bot]

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[process-bot]

Thanks for the issue! Make sure it satisfies this checklist. My human colleagues will appreciate it!

Here is what to expect next, and if anyone wants to comment, keep these things in mind.

[ckoster22]

This looks to be a duplicate of #625

[ckoster22]

This looks to be a duplicate of #625

[jvoigtlaender]

Indeed, it does.

[jvoigtlaender]

Indeed, it does.