[XeTeX] LetterSpace and line breaking

[Vadim Radionov]

According to \tracingparagraphs' output, the first line is tight (1.3),
with badness b=35, while it is in fact overfull and should have b=*.  My
numbers are slightly differen (probably, DejaVu fonts are not identical?)
and \tracingparagraphs gives even decent line  (1.2) with badness b=9
instead of overfull!

@secondpass
[]\EU1/DejaVuSerif(0)/m/n/10 3. \EU1/DejaVuSerif(1)/m/n/10 По-вест-во-
ва-ние  \EU1/DejaVuSerif(0)/m/n/10 со-сто-ит из опи-са-ния
 ис-
@\discretionary via @@0 b=9 p=50 d=2861
@@1: line 1.2- t=2861 -> @@0



On Wed, May 15, 2013 at 1:22 PM, Zdenek Wagner <zdenek.wagner at gmail.com>wrote:

> 2013/5/14 Vadim Radionov <vadim.radionov at gmail.com>:
> > Dear list memers,
> >
> > I encountered a problem: setting LetterSpace parameter somehow breaks
> line
> > breaking mechanism. Consider the following example (in Russian); the 1st
> > variant without \mbox has obvious break point missed. (I'm aware  that
> > letter spacing is strongly discouraged in English texts, suppose that I
> have
> > to reproduce some ancient design as close as possible.)
> >
> The break point is not missed but for some reason its usage leads to a
> paragraph that is considered worse. If I set \tracingparagraphs=1, I
> get:
>
> @firstpass
> []\EU1/DejaVuSerif(0)/m/n/10 3. \EU1/DejaVuSerif(1)/m/n/10 Повествование
>  \EU1/
> DejaVuSerif(0)/m/n/10 состоит из описания
> @ via @@0 b=3 p=0 d=169
> @@1: line 1.2 t=169 -> @@0
> @secondpass
> []\EU1/DejaVuSerif(0)/m/n/10 3. \EU1/DejaVuSerif(1)/m/n/10
> По-вест-во-ва-ние  \
> EU1/DejaVuSerif(0)/m/n/10 со-сто-ит из опи-са-ния ис-
> @\discretionary via @@0 b=35 p=50 d=4525
> @@1: line 1.3- t=4525 -> @@0
> то-рии пред-ме-та по су-ще-ству, т. е. как воз-ник во-
> @\discretionary via @@1 b=50 p=50 d=26100
> @@2: line 2.1- t=30625 -> @@1
> прос, ко-то-рый под-ле-жит раз-ре-ше-нию, и как сло-
> @\discretionary via @@2 b=83 p=50 d=21149
> @@3: line 3.1- t=51774 -> @@2
> жи-лось са-мо де-ло.
> @\par via @@3 b=0 p=-10000 d=5100
> @@4: line 4.2- t=56874 -> @@3
>
>
> Overfull \hbox (14.1539pt too wide) in paragraph at lines 17--20
> []\EU1/DejaVuSerif(0)/m/n/10 3. \EU1/DejaVuSerif(1)/m/n/10 Повествование
>  \EU1/
> DejaVuSerif(0)/m/n/10 состоит из описания ис-
>  []
>
> .................................................
> . fontspec info: "defining-font"
> .
> . Font family 'DejaVuSerif(1)' created for font 'DejaVu Serif' with options
> . [Mapping=tex-text,Script=Cyrillic,LetterSpace=40].
> .
> . This font family consists of the following shapes:
> .................................................
> @firstpass
> []\EU1/DejaVuSerif(0)/m/n/10 3. []  состоит из описания
> @ via @@0 b=3 p=0 d=169
> @@1: line 1.2 t=169 -> @@0
> @secondpass
> []\EU1/DejaVuSerif(0)/m/n/10 3. []  со-сто-ит из опи-са-ния
> @ via @@0 b=3 p=0 d=169
> @@1: line 1.2 t=169 -> @@0
> ис-то-рии пред-ме-та по су-ще-ству, т. е. как воз-ник во-
> @\discretionary via @@1 b=2 p=50 d=2644
> @@2: line 2.2- t=2813 -> @@1
> прос, ко-то-рый под-ле-жит раз-ре-ше-нию, и как сло-
> @\discretionary via @@2 b=83 p=50 d=21149
> @@3: line 3.1- t=23962 -> @@2
> жи-лось са-мо де-ло.
> @\par via @@3 b=0 p=-10000 d=5100
> @@4: line 4.2- t=29062 -> @@3
>
> I am not able to explain the difference. I get the same result in TL
> 2012 and  2013 pretest, the only difference s that TL 2012 does not
> display cyrillic in the log thus it is almost unreadable.
>
> > What kind of bug is it?
> >
> > Thank you in advance,
> > Vadim
> >
> > \documentclass{book}
> > \usepackage{geometry}
> > \geometry{width=9.5cm}
> >
> > \usepackage[no-sscript]{xltxtra}
> > \usepackage{polyglossia}
> >
> > \setdefaultlanguage{russian}
> > \newfontfamily\russianfont[Mapping=tex-text,Script=Cyrillic]{DejaVu
> Serif} %
> > {PT Serif}
> >
> > \emergencystretch4em
> >
> > \begin{document}
> >
> > 3. {\addfontfeature{LetterSpace=40} Повествование} \ состоит из описания
> > истории предмета по
> > существу, т. е. как возник вопрос, который подлежит разрешению,
> > и как сложилось само дело.
> >
> > 3. \mbox{\addfontfeature{LetterSpace=40} Повествование} \ состоит из
> > описания истории предмета по
> > существу, т. е. как возник вопрос, который подлежит разрешению,
> > и как сложилось само дело.
> >
> > \end{document}
> >
> >
> >
> >
> >
> >
> >
> > --------------------------------------------------
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> >
>
>
>
> --
> Zdeněk Wagner
> http://hroch486.icpf.cas.cz/wagner/
> http://icebearsoft.euweb.cz
>
>
>
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>   http://tug.org/mailman/listinfo/xetex
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