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

Dennis Pepler dgpepler at dunelm.org.uk
Tue Sep 22 17:16:02 CEST 2015

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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