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Inside PuTTY is a function called wcwidth(), which tells
us the display width of a given Unicode
code point (e.g., single-width, zero-width/combining, or double-width).
The version we use is a freely available implementation from Markus Kuhn which dates from 2001-01-12. There is a newer version of Markus Kuhn's implementation available; it appears to be dated 2003-05-20, be based on Unicode 4.0, and include some code points outside the BMP, which our version doesn't.
The status of some existing code points seems to have changed. Therefore, feedback on whether this upgrade is a good or bad idea would be much appreciated.
Ignoring changes to wcwidth_cjk() output (we've
only just started using it, so an
upgrade won't affect existing users, although it may make the new
option more or less useful), and U+10000 onwards, the changes are:
/* Combining Diacritical Marks */ 6,9c6,9 < 0300-034E 0 < 034F-035F 1 < 0360-0362 0 < 0363-0482 1 --- > 0300-0357 0 > 0358-035C 1 > 035D-036F 0 > 0370-0482 1 /* Arabic */ 25,27c25,31 < 05C5-064A 1 < 064B-0655 0 < 0656-066F 1 --- > 05C5-05FF 1 > 0600-0603 0 > 0604-060F 1 > 0610-0615 0 > 0616-064A 1 > 064B-0658 0 > 0659-066F 1 /* Gurmukhi */ 65,66c69,70 < 09E4-0A01 1 < 0A02-0A02 0 --- > 09E4-0A00 1 > 0A01-0A02 0 /* Gujarati */ 87c91,93 < 0ACE-0B00 1 --- > 0ACE-0AE1 1 > 0AE2-0AE3 0 > 0AE4-0B00 1 /* Kannada */ 113c119,121 < 0C57-0CBE 1 --- > 0C57-0CBB 1 > 0CBC-0CBC 0 > 0CBD-0CBE 1 /* Tagalog, Hanunoo, Buhid, Tagbanwa, Khmer */ 176c184,194 < 1200-17B6 1 --- > 1200-1711 1 > 1712-1714 0 > 1715-1731 1 > 1732-1734 0 > 1735-1751 1 > 1752-1753 0 > 1754-1771 1 > 1772-1773 0 > 1774-17B3 1 > 17B4-17B5 0 > 17B6-17B6 1 /* more Khmer, Mongolian */ 182,184c200,204 < 17D4-180A 1 < 180B-180E 0 < 180F-18A8 1 --- > 17D4-17DC 1 > 17DD-17DD 0 > 17DE-180A 1 > 180B-180D 0 > 180E-18A8 1 /* Limbu */ 186c206,214 < 18AA-200A 1 --- > 18AA-191F 1 > 1920-1922 0 > 1923-1926 1 > 1927-1928 0 > 1929-1931 1 > 1932-1932 0 > 1933-1938 1 > 1939-193B 0 > 193C-200A 1 /* General Punctuation */ 190c218,220 < 202F-2069 1 --- > 202F-205F 1 > 2060-2063 0 > 2064-2069 1 /* Combining Diacritical Marks for Symbols, Miscellaneous Technical, */ /* CJK Symbols and Punctuation */ 193,199c223,227 < 20D0-20E3 0 < 20E4-2E7F 1 < 2E80-3009 2 < 300A-300B 1 < 300C-3019 2 < 301A-301B 1 < 301C-3029 2 --- > 20D0-20EA 0 > 20EB-2328 1 > 2329-232A 2 > 232B-2E7F 1 > 2E80-3029 2 /* Variation Selectors */ 212c240,242 < FB1F-FE1F 1 --- > FB1F-FDFF 1 > FE00-FE0F 0 > FE10-FE1F 1 /* Halfwidth and Fullwidth Forms */ 218,219c248,249 < FF00-FF5F 2 < FF60-FFDF 1 --- > FF00-FF60 2 > FF61-FFDF 1