[Libreoffice-bugs] [Bug 127920] New: Pair kerning option ignored for certain fonts

[bugzilla-daemon at bugs.documentfoundation.org]

https://bugs.documentfoundation.org/show_bug.cgi?id=127920

            Bug ID: 127920
           Summary: Pair kerning option ignored for certain fonts
           Product: LibreOffice
           Version: 6.3.2.2 release
          Hardware: x86-64 (AMD64)
                OS: All
            Status: UNCONFIRMED
          Severity: normal
          Priority: medium
         Component: Writer
          Assignee: libreoffice-bugs at lists.freedesktop.org
          Reporter: a.skembris at quantdata.gr

Description:
I believe the "pair kerning" option is ignored for some (or all) fonts,
resulting in poor visual results. E.g. for the Open Sans font, if you type
"specifications" and increase character spacing, all spaces are increased
except the space between "f" and "i", resulting in uneven letter spacing and a
gap in the word. "f" and "i" remain attached to each other.  

Steps to Reproduce:
1.Write a word that possibly includes a kerned pair, like "specifications"
(f-i, ti)
2.Select "Open Sans" font, "Calibri", "DejaVu Sans" or some other font (which
possibly contains a kerning table
3.Right click on the word, select "Character -> Character", go to "position"
tab, increase character spacing to e.g. 10pt. 

Actual Results:
The space between certain combinations like "f" and "i" remains the same even
though other letters are spaced further apart. In "Calibri" font this also
happens with "t" and "i". Clicking "Pair kerning" makes no difference to how
the word is displayed. 

Expected Results:
Disabling pair kerning should result in all letters being evenly spaced (I
guess it should be disabled anyway when character spacing is anything other
than the default setting).


Reproducible: Always


User Profile Reset: No


OpenGL enabled: Yes

Additional Info:
Problem is present in both Windows and Linux versions. Tried 6.3.1 and 6.3.2 on
Linux, 6.3.2 on Windows. Exporting to PDF results in the PDF having the same
problem.

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