Implement special sigma casing rule (bug#24603)
In Greek, a sigma character has two lower case forms which depend on their position in the word. Implement logic determining it. * src/casefiddle.c (struct casing_context, case_character_impl): Don’t assume inword is true when flag is CASE_UP and false when flag is CASE_DOWN. For final sigma detection we need this information tracked reliably;. (CAPITAL_SIGMA, SMALL_SIGMA, SMALL_FINAL_SIGMA): New macros defining Unicode code point of different forms of sigma letter. (case_character): Implement support for final sigma casing. (do_casify_multibyte_string, do_casify_multibyte_region): Update after changes to case_character. * test/src/casefiddle-tests.el (casefiddle-tests-casing): Add test cases for final sigma.
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