Linux Biolinum O italic lowercase m not displayed by poppler

[Ian Turner]

STEPS TO REPRODUCE: Create a PDF document with the character U+006D LATIN SMALL LETTER M
 in Linux Biolinum O, for example with libreoffice.

Expected behavior: The 'm' is displayed

Actual behavior: The 'm' is not displayed (but does take up space)

This issue is discussed in this thread in the poppler forum, which leads me to think it is a problem with the font: https://lists.nongnu.org/archive/html/freetype-devel/2018-12/msg00063.html

ProblemType: Bug
DistroRelease: Ubuntu 19.04
Package: fonts-linuxlibertine 5.3.0-4
ProcVersionSignature: Ubuntu 5.0.0-38.41-generic 5.0.21
Uname: Linux 5.0.0-38-generic x86_64
ApportVersion: 2.20.10-0ubuntu27.3
Architecture: amd64
CurrentDesktop: KDE
Date: Sun Mar 1 17:13:17 2020
Dependencies:

PackageArchitecture: all
SourcePackage: fonts-linuxlibertine
UpgradeStatus: No upgrade log present (probably fresh install)

[Ian Turner (vectro)]

There is an upstream bug report at https://sourceforge.net/p/linuxlibertine/bugs/337/ but I am unable to add a bug watch due to Bug #605783.

[Ian Turner (vectro)]

According to the bug report for Libertinus <https://github.com/alif-type/libertinus/issues/300#issuecomment-593409073>, FreeType has accepted this as a bug and released a fix. I updated the bug links accordingly.

[Ian Turner (vectro)]

Libertinus has committed a fix as well. https://github.com/alif-type/libertinus/commit/a0a7467b4655d5b263a44de45ebf11536cc5e7a3

[Sebastien Bacher (seb128)]

http://git.ghostscript.com/?p=user/chrisl/freetype2.git;a=commitdiff;h=c9a14b040932 is the upstream freetype fix if someone wants to work on backporting the change

[Mattia Rizzolo (mapreri)]

the commit seb128 mentions for freetype is present in freetype 2.10.1-1 which is present in focal+.