[DejaVu-bugs] [Bug 48497] New: Arabic vowel diacritics do not combine properly on OS X in Sans Mono

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=48497

             Bug #: 48497
           Summary: Arabic vowel diacritics do not combine properly on OS
                    X in Sans Mono
    Classification: Unclassified
           Product: DejaVu
           Version: unspecified
          Platform: x86 (IA32)
        OS/Version: Mac OS X (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: Mono Sans
        AssignedTo: dejavu-bugs at lists.freedesktop.org
        ReportedBy: joostkremers at fastmail.fm


Created attachment 59712
  --> https://bugs.freedesktop.org/attachment.cgi?id=59712
Screenshot showing incorrectly rendered combining diacritics

Arabic has a number of vowel markers that essentially function as combining
diacritics: they must be placed over or under the letter they are associated
with. On OS X, in the Sans Mono series, these marker are not combined with the
predecing letter but take up horizontal space.

The attached pdf file contains two screenshots. The first shows a word without
vowel marks in the top line, where the letters are properly connected, and the
same word with vowel diacritics, where the letters are not connected. The
second screenshot shows the same file on GNU/Linux, also with DejaVu Sans Mono,
where the diacritics are displayed correctly. (Well, there's still one minor
issue, but I'm pretty sure that's a bug in Emacs.)

My apologies for the poor quality of the images, I had to combine the two pngs
into a single pdf file because Bugzilla doesn't seem to allow me to attach more
than a single file. If you zoom the pdf out a bit, the fonts will look better.

Note: the problematic screenshot was made with Safari under OS X 10.7.3. I have
been told that the problem also occurs with TextEdit.app, but unfortunately, I
cannot test this, because on my machine TextEdit.app does not allow me to
select any of the DejaVu fonts, for some reason beyond my ability to grasp...

Note also that the Serif and Sans series do combine the diacritics correctly
(as tested on Safari).

Joost

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