Gedit has an invalid regular expression, the error is not fatal, but immediately occurs at its start, additionally, it has a critical level GTK error as well

[Zalán Hári]

When the unstable <i>sudo apt-get autoremove</i> removed Gedit, I reinstalled it (with the removed necessary Python packages). When I started it first time from the terminal, I got the following message:
/usr/lib/x86_64-linux-gnu/gedit/plugins/externaltools/library.py:212: SyntaxWarning: invalid escape sequence '\-'
  RE_KEY = re.compile('^([a-zA-Z_][a-zA-Z0-9_.\-]*)(\[([a-zA-Z_@]+)\])?$')

I was able to fix that with replacing \- to \\-, \[ to \\[ and \] to \\], but an average user will have extreme computer rage from it and s/he will shoot the computer. And, in addition, this problem probably makes gedit less efficient.

The huger problem is:
„(gnome-text-editor:31580): Gtk-CRITICAL **: 07:40:03.163: gtk_widget_get_scale_factor: assertion 'GTK_IS_WIDGET (widget)' failed”
Imagine it circa 1000 times.

I attached a quick-and-dirty patch to the first problem.

The additional necessary information has been included by apport.

ProblemType: Bug
DistroRelease: Ubuntu 24.04
Package: gedit 46.1-3 [modified: usr/lib/x86_64-linux-gnu/gedit/plugins/externaltools/library.py]
ProcVersionSignature: Ubuntu 6.6.0-14.14-generic 6.6.3
Uname: Linux 6.6.0-14-generic x86_64
ApportVersion: 2.28.0-0ubuntu1
Architecture: amd64
CasperMD5CheckResult: unknown
CurrentDesktop: ubuntu:GNOME
Date: Mon Feb 26 08:04:39 2024
InstallationDate: Installed on 2023-07-05 (236 days ago)
InstallationMedia: Ubuntu 20.04.6 LTS "Focal Fossa" - Release amd64 (20230316)
ProcEnviron:
 LANG=en_US.UTF-8
 PATH=(custom, no user)
 SHELL=/bin/bash
 TERM=xterm-256color
 XDG_RUNTIME_DIR=<set>
SourcePackage: gedit
UpgradeStatus: Upgraded to noble on 2024-02-24 (2 days ago)
modified.conffile..etc.init.d.apport: [modified]
mtime.conffile..etc.init.d.apport: 2024-02-22T15:20:00

[Ubuntu Foundations Team Bug Bot (crichton)]

The attachment "library.py" seems to be a patch. If it isn't, please remove the "patch" flag from the attachment, remove the "patch" tag, and if you are a member of the ~ubuntu-reviewers, unsubscribe the team.

[This is an automated message performed by a Launchpad user owned by ~brian-murray, for any issues please contact him.]

[Zalán Hári (zalanhari)]

Sorry, there is a mistake in my bug report: the critical GTK error occurs when I close gedit.

[Zalán Hári (zalanhari)]

I clarify: the critical message occurs exactly 248 times at every close if I count it with „gedit 2> /dev/stdout | wc -l”.

[Launchpad Janitor (janitor)]

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