[XeTeX] misplaced accents in printout only?

[David Carlisle]

On 20 January 2016 at 23:42, Zdenek Wagner <zdenek.wagner at gmail.com> wrote:

> As far as I know nowadays with HarfBuzz it does nothing, HarfBuzz handles
> normalization in its own way.
>
> Zdeněk Wagner
> http://ttsm.icpf.cas.cz/team/wagner.shtml
> http://icebearsoft.euweb.cz
>
> 2016-01-21 0:35 GMT+01:00 maxwell <maxwell at umiacs.umd.edu>:
>
>> On 2016-01-20 17:59, Dominik Wujastyk wrote:
>>
>>> ...
>>> *Input normalization*
>>>
>>> I left {CMU Serif Italic} as the document font, and added
>>> \XeTeXinputnormalization=1 to the preamble
>>>
>>> This also produced PDF that printed *correctly* in all cases.
>>>
>>
>> Hmmm, is there documentation for this \XeTeXinputnormalization?  I can
>> find some references to it in a web search, but no explanation of exactly
>> what it does.  What does "normalization" mean (NFC, NFD,...)?  Under what
>> circumstances (besides the one Dominik saw) should this setting be used?  I
>> don't want to go through printouts of 300 page documents looking for
>> misplaced diacritics...
>>
>>    Mike Maxwell
>>
>>
It's in the xetex manual (texdoc xetex) 0 is off, 1 is NFC 2 is NFD

It affects tokenization so does have an effect whatever font library is in
use see



\def\zz#1#2{[#1]}

\zz á12

\zz á12


\XeTeXinputnormalization=1

\def\zz#1#2{[#1]}

\zz á12

\zz á12

\bye


where the first line produces [a] as it separates the ascii a from the
following combing character but the third line which is also input using a
combing character produces [] the same as lines 2 and 4 which use the
pre-composed U+00E1 (which is nothing here as I'm using cmr)

David
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