https://bugs.freedesktop.org/show_bug.cgi?id=60427
Priority: medium
Bug ID: 60427
Assignee: [email protected]
Summary: Missing ZWNJ support for German ligature handling
Severity: normal
Classification: Unclassified
OS: All
Reporter: [email protected]
Hardware: Other
Status: UNCONFIRMED
Version: 4.1.0.0.alpha0+ Master
Component: Writer
Product: LibreOffice
Created attachment 74360
--> https://bugs.freedesktop.org/attachment.cgi?id=74360&action=edit
Test file with plain fi replacement, and without it using ZWNJ, ZWJ and ZWS
German typography could use zero width non-joiner (ZWNJ) characters to fix the
automatic ligature handling of OpenType or Graphite fonts, see
http://en.wikipedia.org/wiki/Zero-width_non-joiner.
LibreOffice has limited support for this feature, also there are problems with
text search and spell checking, too, see the attached test file and screenshot.
(It uses Linux Libertine G with automatic ligature replacement.)
Workaround for ligature handling:
– try zero-width space (U-200B) instead of ZWNJ or
– use the font specific ligature settings (eg. "Linux Libertine G:liga=0"
special font name) for the full word (or word part to keep ligatures in the
other word parts)
Workaround for spell checking:
Specify ZWNJ with IGNORE feature of Hunspell in the affix file (it works with
UTF-8 encoded Hunspell dictionaries):
IGNORE <U-200C>
where <U-200C> is the UTF-8 encoded U-200C ZWNJ
Plans:
LibreOffice/Hunspell:
– remove ZWNJ automatically for 8-bit encoded dictionaries
– add IGNORE ZWNJ to UTF-8 encoded dictionaries (English, Hungarian)
Linux Libertine G, Biolinum G:
– add/fix ZWNJ letter to avoid bad kerning (see screenshot)
– use short f for f + ZWNJ
– maybe it is better to remove the default ligature replacement for German (it
is possible to set in the Graphite font)
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