Unicode: fix the extended grapheme cluster algorithm

UAX #29 in Unicode 11 changed the EGC algorithm to its current form.
Although Qt has upgraded the Unicode tables all the way up to
Unicode 13, the algorithm has never been adapted; in other words,
it has been working by chance for years. Luckily, MOST
of the cases were dealt with correctly, but emoji handling
actually manages to break it.

This commit:

* Adds parsing of emoji-data.txt into the unicode table generator.
  That is necessary to extract the Extended_Pictographic property,
  which is used by the EGC algorithm.

* Regenerates the tables.

* Removes some obsoleted grapheme cluster break properties, and
  adds the ones added in the meanwhile.

* Rewrites the EGC algorithm according to Unicode 13. This is
  done by simplifying a lot the lookup table. Some rules (GB11,
  GB12, GB13) can't be done by the table alone so some hand-rolled
  code is necessary in that case.

* Thanks to these fixes, the complete upstream GraphemeBreakTest
  now passes. Remove the "edited" version that ignored some rows
  (because they were failing).

Change-Id: Iaa07cb2e6d0ab9deac28397f46d9af189d2edf8b
Fixes: QTBUG-92822
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>
Reviewed-by: Konstantin Ritt <ritt.ks@gmail.com>
(cherry picked from commit a794c5e287381bd056008b20ae55f9b1e0acf138)
Reviewed-by: Qt Cherry-pick Bot <cherrypick_bot@qt-project.org>

0 files changed, 0 insertions, 0 deletions