[texworks] texworks Digest, Vol 85, Issue 9 - rectangles

David J. Perry hospes.primus at verizon.net
Thu Sep 24 00:23:29 CEST 2015

I have TeXworks 0.4.6, r.c. 29723a, dated 4/3/15.  I believe that this 
version was supplied by MikTeX.  MikTeX was updated last week so 
everything should be current.  When you say "as I controlled in 
XeLaTeX," I take that to mean you tried some Plane 1 characters and they 
worked correctly -- is that right?  I have not seen a reply from Philip.

Thanks - David

On 9/23/2015 3:24 AM, Alain Delmotte wrote:
> It is not a TeXworks problem, as pointed ot by Philip Taylor (in 
> XeTeX) and as I controlled in XeLaTeX.
> It could be a problem of your installation of the TeX distribution or 
> your TeXworks installation.
> By the way, which distribution you are using and which TeXworks?
> --
> Alain
> Le 23/09/2015 01:43, David J. Perry a écrit :
>> Thank you for the reply, Dennis.  I don't think it's a Windows issue, 
>> though, since the characters in question work correctly in several 
>> other Windows programs (Word, Libreoffice, Notepad) -- that's why I 
>> think it's a TeXworks issue.  The characters are in the Old Italic 
>> block of Unicode, U+10300 and higher.
>> Could TeXworks have an issue with characters in the supplementary 
>> planes?  I don't normally use any of these scripts except Old 
>> Italic.  To test this, I just copied some characters from the Runic 
>> block and pasted them into Notepad -- OK.  Then I pasted them into 
>> TeXworks and changed the font to one that I know supports Runic.  
>> This time I got black rectangles.  (This was a different font from 
>> the one that I used with Old Italic.) Furthermore, the .notdef glyph 
>> in this font has the shape of a tall narrow rectange, but I am seeing 
>> almost squares.  There does seem to be something going on here.
>> ----- Original Message ----- From: "Dennis Pepler" 
>> <dgpepler at dunelm.org.uk>
>> To: <texworks at tug.org>
>> Sent: Tuesday, September 22, 2015 11:16 AM
>> Subject: Re: [texworks] texworks Digest, Vol 85, Issue 9 - rectangles
>> The rectangles are "notdef" characters. They appear when Windows 
>> detects what it considers asa “not defined” character. You may have a 
>> problem with default ignorable code points.
>> This comes about because of the concept of"default ignorable code 
>> points". Windows has incorporated andprogressively enhanced its 
>> Unicode support since Windows 2000. Where in thepast legacy 
>> applications running in legacy versions of Windows took 
>> charactersfrom the range 128-159 and displayed them, it appears that 
>> Windows will nowintercept calls for characters in hacked (customised) 
>> fonts and display (ornot!) one of the three variants stipulated for 
>> this scenario:· a zero width character (the screen is blankwhere a 
>> glyph should appear, and characters either side of the glyph appear 
>> tobe adjacent)· a space (i.e. decimal 32) – blank space on thescreen 
>> again.· the rectangle Microsoft refers to internally as'notdef'
>> These are "defaultignorable code points". Copy the "blank spaces" or 
>> the rectangles - whichever - and paste into MS Word. Then check each 
>> character position in turn using the Alt-X trick to reveal the 
>> intended code point value.
>> Contact me off-list if you wish.
>> Dennis Pepler
>> Sent: Tuesday, 22 September 2015, 11:00
>> Subject: texworks Digest, Vol 85, Issue 9
>> 1. Re: Plane 1 characters not visible in TeXworks (David J. Perry)
>> This is a followup to my post from yesterday. Things get weirder.
>> Earlier tonight I opened TexWorks to do some more work on the file I
>> used yesterday. This time I saw empty rectangles where the Old Italic
>> characters are. This is better than nothing, although I'm still not
>> sure why the characters won't display.
>> A few minutes ago I wanted to make a last-minute correction and opened
>> the file again. Same computer, same fonts, same everything as earlier
>> today, but now we are back to total blanks. ???
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