[Mono-bugs] [Bug 480152] string.Normalize() frequently produces incorrect output

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http://bugzilla.novell.com/show_bug.cgi?id=480152

http://bugzilla.novell.com/show_bug.cgi?id=480152#c30


--- Comment #30 from Damien Diederen <dd at crosstwine.com> 2010-04-17 23:46:11 UTC ---
Created an attachment (id=355160)
 --> (http://bugzilla.novell.com/attachment.cgi?id=355160)
Normalization: Prevent an unwarranted system exception when doing composition

This patches fixes additional problems reported by Tom via email.

Without this, the algorithm crashes on sequences such as
\u05D0\u0307\u05DC: the decomposition \u05D0\u05DC matches because
\u0307 has a higher combining class than \u05DC, but the decomposition
is nowhere to be found in some auxiliary table because that mapping is
not canonical.

The updated version considers that no matching decomposition was
found, and does not recompose.  This, however, is not *strictly*
correct; there may very well be cases where other, canonical, matching
decompositions follow the non-canonical one in the encoded database.

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