Bug#986110: gnome-software: Fails to close properly

[Pelle]

Package: gnome-software
Version: 3.38.1-1
Severity: normal

Dear Maintainer,

The close button (x) in the upper right corner of the Gnome Software window
doesn't properly close Gnome Software.

To reproduce:
  - Run `gnome-software` from the shell
  - Once the Gnome Software window appears, click on the close button
  - The Gnome Software window will disappear but the gnome-software process
will keep running

-- System Information:
Debian Release: bullseye/sid
  APT prefers unstable-debug
  APT policy: (500, 'unstable-debug'), (500, 'unstable'), (1, 'experimental')
Architecture: amd64 (x86_64)
Foreign Architectures: i386

Kernel: Linux 5.10.0-4-amd64 (SMP w/2 CPU threads)
Kernel taint flags: TAINT_CRAP
Locale: LANG=en_GB.UTF-8, LC_CTYPE=en_GB.UTF-8 (charmap=UTF-8),
LANGUAGE=en_US:en
Shell: /bin/sh linked to /usr/bin/dash
Init: systemd (via /run/systemd/system)
LSM: AppArmor: enabled

Versions of packages gnome-software depends on:
ii  appstream                                    0.14.2-1
ii  apt-config-icons                             0.14.2-1
ii  dconf-gsettings-backend [gsettings-backend]  0.38.0-2
ii  gnome-software-common                        3.38.1-1
ii  gsettings-desktop-schemas                    3.38.0-2
ii  libappstream-glib8                           0.7.18-1
ii  libatk1.0-0                                  2.36.0-2
ii  libc6                                        2.31-10
ii  libcairo2                                    1.16.0-5
ii  libfwupd2                                    1.5.7-3
ii  libgdk-pixbuf-2.0-0                          2.42.2+dfsg-1
ii  libglib2.0-0                                 2.66.8-1
ii  libgspell-1-2                                1.8.4-1
ii  libgtk-3-0                                   3.24.24-3
ii  libgtk3-perl                                 0.038-1
ii  libgudev-1.0-0                               234-1
ii  libjson-glib-1.0-0                           1.6.2-1
ii  libmalcontent-0-0                            0.10.0-2
ii  libpackagekit-glib2-18                       1.2.2-2
ii  libpolkit-gobject-1-0                        0.105-30
ii  libsoup2.4-1                                 2.72.0-2
ii  libxmlb1                                     0.1.15-2
ii  packagekit                                   1.2.2-2
ii  software-properties-gtk                      0.96.20.2-2.1

Versions of packages gnome-software recommends:
ii  fwupd  1.5.7-3

Versions of packages gnome-software suggests:
pn  apt-config-icons-hidpi         <none>
pn  gnome-software-plugin-flatpak  <none>
pn  gnome-software-plugin-snap     <none>