GNOME Bugzilla – Bug 648155
Incorrect support for ligatures
Last modified: 2011-05-02 19:42:38 UTC
Trying out new free/libre font called Lobster  that has cyrrillic ligatures, I've run into a horrible bug: typing in «ба» combination of letters in any Pango driven app like Inkscape and GIMP gives me «яч» combination instead of «ба» with a ligature between «б» and «а». I'm using Pango 1.28.0 from Ubuntu 10.04.
Created attachment 186237 [details]
Since you ask, here is a screenshot.
The right part is two letters that were typed in. The smaller left part is what it is rendered like.
Sounds like a bug in GoogleFonts subsetting the font. I'm fairly sure we don't subset GSUB/GPOS tables, so they are supposed to be dropped. If they are not, it's a bug.
Just in case...
$ fontlint ~/Media/Fonts/Lobster.ttf
Copyright (c) 2000-2010 by George Williams.
Executable based on sources from 09:08 GMT 16-Jun-2010.
Library based on sources from 03:43 GMT 29-Apr-2010.
The glyph named mu is mapped to U+00B5.
But its name indicates it should be mapped to U+03BC.
Validation Lobster ...Passed
Created attachment 186239 [details]
lost ligature in inkscape
And since it looks related to https://bugzilla.gnome.org/show_bug.cgi?id=648157, let me scare you even further. When I apply a different color to a letter in a word in Inkscape, the ligature gets lost.
That one is a Inkscape (and possibly Gtk) bug. Pango handles that case correctly.
The issue was confirmed by font's developer on a non-Linux system. I think you can safely close this report as WONTFIX :)