FWIW, as it came up as a question in the main track FOSDEM LibreOffice
talk, in vcl/generic/glyphs/gcach_layout.cxx see IcuLayoutEngine::layout
and...
if (rArgs.mnFlags & SAL_LAYOUT_ENABLE_LIGATURES)
nLayoutFlags |= LayoutEngine::kTypoFlagLiga;
so ligatures are disabled by default unless SAL_LAYOUT_ENABLE_LIGATURES
is enabled, and SAL_LAYOUT_ENABLE_LIGATURES is only set if
TEXT_LAYOUT_ENABLE_LIGATURES is set on the outputdevice, and that
doesn't happen anywhere as of yet :-(
It would be no major problem to e.g. bubble up allowing those ligatures
to be set explicitly via the UI, or e.g. defaulted on via a new
compatibility flag for new docs, but the last time I played around with
it I ran into the snag that with our current Linux rendering stack via
cairo we get the unfortunate visual effect that ligatures appear bold in
Calibri, etc.
Here's a screenshot of gedit which renders for me today like we would do
if we enabled ligatures in above code.
https://bugzilla.redhat.com/attachment.cgi?id=613610
from https://bugzilla.redhat.com/show_bug.cgi?id=857860
C.
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