[DejaVu-bugs] [Bug 26941] New: stacked diacritics cause bizarre overstrikes in Sans Mono

[bugzilla-daemon at freedesktop.org]

http://bugs.freedesktop.org/show_bug.cgi?id=26941

           Summary: stacked diacritics cause bizarre overstrikes in Sans
                    Mono
           Product: DejaVu
           Version: unspecified
          Platform: Other
        OS/Version: All
            Status: NEW
          Severity: normal
          Priority: medium
         Component: Mono Sans
        AssignedTo: dejavu-bugs at lists.freedesktop.org
        ReportedBy: maxwell at umiacs.umd.edu


Attempting to add two (stacked) diacritics to a single letter results in nearby
characters overstriking each other.

For example, the sequence
  [-a<combining macron><combining acute>]
results in the two square brackets appearing to the left of the 'a' with a
macron, while the combining acute and ASCII dash overstrike the second square
bracket.  (This particular sequence of characters arose in a grammar we're
writing, but the problem appears to be reproducible with a variety of
punctuation characters and combining diacritics; the key appears to be having
two diacritics.)

Similarly, the sequence
   o-a<combining macron><combining acute>o
results in a jumbled sequence which looks like 
   ooa
(yes, the second 'o' hops to the left over the 'a'!), with the dash through the
middle of the second 'o', and the acute accent over the second 'o' (instead of
over the 'a').  (The macron is in the correct place, over the 'a', although of
course the 'a' is in the wrong place.)

I have reproduced this in the following ways:
(1) in MsWord 2003 in Vista, on-screen
(2) in a PDF produced from (1) using PDFCreator (result is slightly different:
both the macron and the acute accent correctly appear over the 'a', although
the 'a' is still in the wrong place)
(3) in XeTeX under Linux (here the output is if possible even more jumbled,
with the acute accent appearing over the *first* 'o')

I attach a PDF of (2).

This may be related to another bug which I just submitted, on stacked
diacritics using the Sans (but not Mono) font.  It may also be related to bug
18614, although the latter refers only to Cyrillic characters.


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