[Upstream] Vertical fraction feature present in font not applied by Writer

[Dr Anirban Mitra]

~ $ lsb_release -rd
Description: Ubuntu 20.04.3 LTS
Release: 20.04
 ~$ apt-cache policy libreoffice-writer
libreoffice-writer:
  Installed: 1:6.4.7-0ubuntu0.20.04.2
  Candidate: 1:6.4.7-0ubuntu0.20.04.2
  Version table:
 *** 1:6.4.7-0ubuntu0.20.04.2 500
        500 http://security.ubuntu.com/ubuntu focal-security/main amd64 Packages
        100 /var/lib/dpkg/status
     1:6.4.2-0ubuntu3 500
        500 http://in.archive.ubuntu.com/ubuntu focal/main amd64 Packages
~$ apt-show-versions -r libreoffice*
liblibreofficekitgtk:amd64/focal-security 1:6.4.7-0ubuntu0.20.04.2 uptodate
libreoffice-base-core:amd64/focal-security 1:6.4.7-0ubuntu0.20.04.2 uptodate
libreoffice-calc:amd64/focal-security 1:6.4.7-0ubuntu0.20.04.2 uptodate
libreoffice-common:all/focal-security 1:6.4.7-0ubuntu0.20.04.2 uptodate
libreoffice-core:amd64/focal-security 1:6.4.7-0ubuntu0.20.04.2 uptodate
libreoffice-draw:amd64/focal-security 1:6.4.7-0ubuntu0.20.04.2 uptodate
libreoffice-gnome:amd64/focal-security 1:6.4.7-0ubuntu0.20.04.2 uptodate
libreoffice-gtk:all/focal-security 1:6.4.7-0ubuntu0.20.04.2 uptodate
libreoffice-gtk2:all/focal-security 1:6.4.7-0ubuntu0.20.04.2 uptodate
libreoffice-gtk3:amd64/focal-security 1:6.4.7-0ubuntu0.20.04.2 uptodate
libreoffice-impress:amd64/focal-security 1:6.4.7-0ubuntu0.20.04.2 uptodate
libreoffice-java-common:all/focal-security 1:6.4.7-0ubuntu0.20.04.2 uptodate
libreoffice-l10n-bn:all/focal-security 1:6.4.7-0ubuntu0.20.04.2 uptodate
libreoffice-math:amd64/focal-security 1:6.4.7-0ubuntu0.20.04.2 uptodate
libreoffice-style-colibre:all/focal-security 1:6.4.7-0ubuntu0.20.04.2 uptodate
libreoffice-style-elementary:all/focal-security 1:6.4.7-0ubuntu0.20.04.2 uptodate
libreoffice-style-tango:all/focal-security 1:6.4.7-0ubuntu0.20.04.2 uptodate
libreoffice-writer:amd64/focal-security 1:6.4.7-0ubuntu0.20.04.2 uptodate
libreofficekit-data:all/focal-security 1:6.4.7-0ubuntu0.20.04.2 uptodate

What is expected to happen in Writer is

My font has vertical fraction look up for Bengali script. On selecting Format > Characters > CTL Font > Features Alternate (vertical) Fraction Feature is visible in options. Selecting the option should apply the feature on selected fraction

see screenshot http://cloud.atipra.in/index.php/s/YosGiyFSoTQeW8i
What happened instead is..

The feature is not applied, and the selected text is unchanged

It should change as happens in firefox on selecting alternate (Vertical) fraction lookup in css
see screenshot http://cloud.atipra.in/index.php/s/MxYbEisyFT3KnKT

Extension installed : None

ProblemType: Bug
DistroRelease: Ubuntu 20.04
Package: libreoffice-writer 1:6.4.7-0ubuntu0.20.04.2
ProcVersionSignature: Ubuntu 5.4.0-100.113-generic 5.4.166
Uname: Linux 5.4.0-100-generic x86_64
NonfreeKernelModules: nvidia_modeset nvidia
ApportVersion: 2.20.11-0ubuntu27.21
Architecture: amd64
CasperMD5CheckResult: skip
CurrentDesktop: ubuntu:GNOME
Date: Fri Feb 25 20:33:24 2022
InstallationDate: Installed on 2020-01-03 (783 days ago)
InstallationMedia: Ubuntu 18.04 LTS "Bionic Beaver" - Release amd64 (20180426)
SourcePackage: libreoffice
UpgradeStatus: Upgraded to focal on 2021-09-16 (162 days ago)

[Dr Anirban Mitra (mitradranirban)]

Description:
My font has vertical fraction look up for Bengali script. On selecting Format > Characters > CTL Font > Features Alternate (vertical) Fraction Feature is visible in options. Selecting the option should apply the feature on selected fraction

Steps to Reproduce:
1. Write the fraction using slash
2. Select the text
3. Menu Format > Character > Feature > Select Alternate (Vertical) Fraction

Actual Results:
See screenshot http://cloud.atipra.in/index.php/s/YosGiyFSoTQeW8i

Expected Results:
See screenshot http://cloud.atipra.in/index.php/s/MxYbEisyFT3KnKT

Reproducible: Always

User Profile Reset: Yes

Additional Info:
libreoffice-writer 1:6.4.7

[Dr Anirban Mitra (mitradranirban)]

Created attachment 178555
Problem also in Libreoffice 7.1.2 in Fedora

Showing that it is not an Ubuntu specific error as problem persists in Fedora 34 with Libreoffice Community version 7.1.2

[julien2412 (serval2412-6)]

6.4 LO version is EOL (End Of Life), like 7.0 and 7.1 branches.
Could you give a try to LO 7.2.5 or brand new 7.3.0 ?

On which Linux distrib are you? If Ubuntu, you can try repositories from LO ppa (see https://launchpad.net/~libreoffice/+archive/ubuntu/ppa)

[Dr Anirban Mitra (mitradranirban)]

I installed Version: 7.3.0.3 / LibreOffice Community
Build ID: 30(Build:3)
CPU threads: 4; OS: Linux 5.4; UI render: default; VCL: gtk3
Locale: en-IN (en_GB.UTF-8); UI: en-US
Ubuntu package version: 1:7.3.0~rc3-0ubuntu0.20.04.1~lo1
from ubuntu ppa
However the problem persists - see screenshot
https://cloud.atipra.in/index.php/s/qKTqY6ZR7fxBDp8

[julien2412 (serval2412-6)]

Thank you for your feedback.
Would it be possible you attach a minimal odt file (with an ad hoc Bengali character which triggers the pb) and provide some link to download the specific font you use?
BTW, does it happen only with a specific font or any font?

[Dr Anirban Mitra (mitradranirban)]

Created attachment 178558
Test document to test the afrc feature

It occurs with my font and another font ShonarBangla.ttf by Monotype Corporation / Microsoft which is only other Bengali font I know to have this feature.

My font is available for testing at https://github.com/mitradranirban/fonts-mukti/releases/download/3.0.1/mukti.otf

[Dr Anirban Mitra (mitradranirban)]

to see how the feature is applied in browsers like Firefox, Chrome please visit https://fonts.atipra.in/afrc-test.html

[julien2412 (serval2412-6)]

Thank you for your feedback. I could reproduce the pb => let's put this one to NEW.

[Dr Anirban Mitra (mitradranirban)]

Bug reported upstream - closing here
https://bugs.documentfoundation.org/show_bug.cgi?id=147661

[Buzea-bogdan (buzea-bogdan)]

Also in
Version: 7.6.0.0.alpha1+ (X86_64) / LibreOffice Community
Build ID: 3070091c9eafc964ebb3f53d3b44124b40571fd8
CPU threads: 16; OS: Linux 5.19; UI render: default; VCL: gtk3
Locale: ro-RO (ro_RO.UTF-8); UI: en-US
Calc: threaded

[Buzea-bogdan (buzea-bogdan)]

Created attachment 189723
screenshot

This is how LibreOffice render now this document.
Seems ok to me.

Version: 24.2.0.0.alpha0+ (X86_64) / LibreOffice Community
Build ID: a34dcd03254480927c403d904c0e754802d97b90
CPU threads: 4; OS: Linux 5.15; UI render: default; VCL: gtk3
Locale: ro-RO (ro_RO.UTF-8); UI: en-US
Calc: threaded

[Dr Anirban Mitra (mitradranirban)]

The rendering is still flawed
To see how it should be renderered, please see https://fonts.atipra.in/afrc-test.html in a browser like firefox or chrome

[Dr Anirban Mitra (mitradranirban)]

It is not corrcted yet
To see the proper expected rendering open the following webpage in firefox and compare the result with Libreoffice
https://fonts.atipra.in/afrc-test.html

[Dr Anirban Mitra (mitradranirban)]

Created attachment 193019
Screen shot from firefox showing proper rendering

This is how the vertical fraction should look. Newer versions of Chrome also messes it so see the link https://fonts.atipra.in/afrc-test.html in Firefox only o see the proper rendering