On 22.05.18 12:51, Martinho Fernandes via Unicode wrote: > Hello, > > None of the *_Break properties are stable, as far as I can see in > https://www.unicode.org/policies/stability_policy.html. If I understand > correctly, this means that, at least in theory, it is possible that in > Unicode version X a sequence of characters AB forms an extended grapheme > cluster, i.e. A × B in the notation used in the algorithm description > and in the test data, but then in Unicode version X+1, that changes to A > ÷ B. > > Am I reading this correctly or is this not possible? Or is it possible > in theory but not in practice? Or maybe it has happened before? > Hmm, to answer my own question, yes, this has happened before. In Unicode 8 there were no breaks between regional indicators. In Unicode 9 now there are no breaks "between regional indicator (RI) symbols if there is an odd number of RI characters before the break point". I has also happened in the direction break=>no break, with when emoji ZWJ sequences were introduced.
-- Martinho
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