RGA.diff: Ivestigate what bad can happen when splitting multi-codepoint "characters" into codepoints

What bad can happen if we split `é` into `e` + `´`?

See also 2-codepoint country flags.

> For this, Unicode has a concept of “grapheme cluster”. There’s also “extended grapheme cluster” (EGC), which is basically an updated version of the concept.

http://unicode.org/glossary/#grapheme_cluster

http://www.unicode.org/reports/tr29/#Grapheme_Cluster_Boundaries