Widgets do not scale inside parent window.

[Bram Stolk]

When the software updater runs, and is loading new packages, the window resize does not work as it should.

This hampers usability.

See screenshot.

Once the actual update process starts, the content does scale.

To repro:
Press "Details" when it is loading packages.
Resize the window.

ProblemType: Bug
DistroRelease: Ubuntu 18.04
Package: update-manager 1:18.04.11.10
ProcVersionSignature: Ubuntu 4.15.0-72.81-generic 4.15.18
Uname: Linux 4.15.0-72-generic x86_64
NonfreeKernelModules: nvidia_uvm nvidia_drm nvidia_modeset nvidia
ApportVersion: 2.20.9-0ubuntu7.9
Architecture: amd64
CurrentDesktop: ubuntu:GNOME
Date: Fri Jan 24 08:46:47 2020
GsettingsChanges:
 b'com.ubuntu.update-manager' b'first-run' b'false'
 b'com.ubuntu.update-manager' b'launch-time' b'int64 1579884383'
 b'com.ubuntu.update-manager' b'launch-count' b'54'
InstallationDate: Installed on 2018-04-29 (635 days ago)
InstallationMedia: Ubuntu 18.04 LTS "Bionic Beaver" - Release amd64 (20180426)
PackageArchitecture: all
ProcEnviron:
 LANGUAGE=en_CA
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=en_CA.UTF-8
 SHELL=/bin/bash
SourcePackage: update-manager
UpgradeStatus: No upgrade log present (probably fresh install)

[Launchpad Janitor (janitor)]

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