window resizes incorrectly across different screens

[Lorenzo Ranieri]

Hiding the details on a different screen from the one they were shown on causes the white background of the window to appear shifted w.r.t the border. This happens regardless of the screen it is done on and in all phases of the update process, including when the details disappear at the end. Moving the window on a different screen fixes the mismatch.

To reproduce:
1) launch update-manager while having updates to install;
2) click on the "Details" button to show the details;
3) move the window on a different screen;
4) click again on "Details".

ProblemType: Bug
DistroRelease: Ubuntu 20.10
Package: update-manager 1:20.10.1
ProcVersionSignature: Ubuntu 5.8.0-31.33-generic 5.8.17
Uname: Linux 5.8.0-31-generic x86_64
NonfreeKernelModules: nvidia_modeset nvidia
ApportVersion: 2.20.11-0ubuntu50.2
Architecture: amd64
CasperMD5CheckResult: skip
CurrentDesktop: ubuntu:GNOME
Date: Tue Dec 8 20:43:51 2020
ExecutablePath: /usr/bin/update-manager
InstallationDate: Installed on 2019-05-28 (559 days ago)
InstallationMedia: Ubuntu 19.04 "Disco Dingo" - Release amd64 (20190416)
InterpreterPath: /usr/bin/python3.8
PackageArchitecture: all
ProcEnviron:
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=it_IT.UTF-8
 SHELL=/bin/bash
Python3Details: /usr/bin/python3.8, Python 3.8.6, python3-minimal, 3.8.6-0ubuntu1
PythonDetails: /usr/bin/python2.7, Python 2.7.18, python-is-python2, 2.7.17-4
SourcePackage: update-manager
UpgradeStatus: No upgrade log present (probably fresh install)

[Lorenzo Ranieri (lorenzo-ranieri)]

The bug no longer appears as of 5.8.0-40