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TTP# 336464 - Editor: Finish the Multiline Editable Text Block There are two versions of this, which are typedef'd to FICUTextCharacterIterator based on the current platform string traits. FICUTextCharacterIterator_NativeUTF16 is used on platforms where TCHAR is already in a native UTF-16 format (as used by ICU), so performs no conversion and just passes the internal string data through to an icu::UCharCharacterIterator. Windows, Xbox One, and PS4 use this iterator. FICUTextCharacterIterator_ConvertToUnicodeString is used on platforms where TCHAR is not in a native UTF-16 format, and performs a conversion to an icu::UnicodeString which is then passed into an icu::StringCharacterIterator - this has the same behaviour and cost as every platforms had prior to this change. OS X, iOS, Android, and Linux use this iterator. Other changes: - Renamed the Convert functions in ICUUtilities to either ConvertString or ConvertChar32 to make it clearer what they were doing. - Removed the ConvertChar32 functions which were attempting to convert a UChar32 back to a TCHAR (as this is neither safe or sane). - Added IsUnicodeEncoded to FGenericPlatformString. This is used along with the sizeof(TCHAR) at compile time to work out if the platform is using UTF-16. ReviewedBy Justin.Sargent [CL 2116572 by Jamie Dale in Main branch]