gnome-font-manager hangs on launch, sometimes

[Stephen T Satchell]

/usr/bin/gnome-font-viewer, /usr/libexec/font-manager/font-viewer

Launch from favorites, shows windows, not responding to window actions and close
Launch new window from favorites, same thing happens.
Launch from show-applications window, same thing happens.

THis is occasional, not constant.

ProblemType: Bug
DistroRelease: Ubuntu 20.04
Package: font-manager 0.7.7-0.3
ProcVersionSignature: Ubuntu 5.15.0-86.96~20.04.1-generic 5.15.122
Uname: Linux 5.15.0-86-generic x86_64
ApportVersion: 2.20.11-0ubuntu27.27
Architecture: amd64
CasperMD5CheckResult: skip
CurrentDesktop: ubuntu:GNOME
Date: Wed Oct 18 03:03:18 2023
InstallationDate: Installed on 2021-06-13 (856 days ago)
InstallationMedia: Ubuntu 20.04 LTS "Focal Fossa" - Release amd64 (20200423)
ProcEnviron:
 TERM=xterm-256color
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=en_US.UTF-8
 SHELL=/bin/bash
SourcePackage: font-manager
UpgradeStatus: No upgrade log present (probably fresh install)

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.

[Yves Roggeman (yrogge)]

I think this problem happens systematically when new users fonts have been added.
Maybe an incorrect or too slow update of the fonts database.
But font-manager definetly freezes, not just waits till some update is completed.

I'am using font-manager version 0.8.8.202402200131~ubuntu23.10.1 (on Ubuntu 23.10)