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
Pick-to: 6.1 6.0 5.15
Fixes: QTBUG-92822
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>
Reviewed-by: Konstantin Ritt <ritt.ks@gmail.com>
Include WordBreakTest.html, since a test uses sample strings from it,
albeit without actually reading the file.
Had to comment out more of the new tests, as at Revision 24, pending
an update to harfbuzz and the text boundary detection code.
Task-number: QTBUG-79631
Task-number: QTBUG-79418
Task-number: QTBUG-82747
Change-Id: I0082294b09d67ffdc6a9b5c15acf77ad3b86f65f
Reviewed-by: Lars Knoll <lars.knoll@qt.io>
Had to teach the update program to accept category Lm as for
Joining_Transparent, for the sake of a new ArabicShaping.txt entry.
Added three new Unicode versions, several new scripts and a new
word-break class.
Updated UCD's test data for tst_QTextBoundaryFinder. This left 57
tests failing; I have commented out the data rows for those tests,
pending someone with more knowledge addressing this.
Task-number: QTBUG-79631
Task-number: QTBUG-79418
Change-Id: Ic33d3b3551195d47a84d98e84020f57a68f0b201
Reviewed-by: Eskil Abrahamsen Blomfeldt <eskil.abrahamsen-blomfeldt@qt.io>
Giuseppe D'Angelo
Edward Welbourne