PuTTY semi-bug wcwidth-upgrade

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summary: Upgrade wcwidth() to Markus Kuhn's latest version
class: semi-bug: This might or might not be a bug, depending on your precise definition of what a bug is.
difficulty: fun: Just needs tuits, and not many of them.
priority: low: We aren't sure whether to fix this or not.
fixed-in: 2005-03-24 (0.58) (0.59) (0.60)

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

Audit trail for this semi-bug.

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(last revision of this bug record was at 2005-03-23 20:04:08 +0000)