[Bug 2034763] Re: Flatpak applications ignore appearance settings with glib2.0 2.77.3 and xdg-desktop-portal 1.17.2

[Sebastien Bacher]

The issue comes from the new xdg-desktop-portal, see
https://github.com/flatpak/xdg-desktop-portal/pull/1082 for details

The new configuration system gives more flexibility to the desktop
environment to select the portal variants that should be used but it
might require tweaks from those desktop environments

The GNOME configuration which fixes the issue was added in 
https://salsa.debian.org/gnome-team/gnome-session/-/commit/b201c9c4 
which is including in the gnome-session version uploaded to Ubuntu yesterday

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Title:
  Flatpak applications ignore appearance settings with glib2.0 2.77.3
  and xdg-desktop-portal 1.17.2

Status in glib2.0 package in Ubuntu:
  Invalid
Status in xdg-desktop-portal package in Ubuntu:
  New

Bug description:
  I use Plasma desktop in Mantic. With the latest versions of glib2.0
  and xdg-desktop-portal all Flatpak applications ignore host settings
  like GTK theme, cursor theme and window controls position. I can get
  proper appearance only in the following state:

  > sudo apt list --upgradable 
  Listing... Done
  libglib2.0-0/mantic 2.77.3-1 amd64 [upgradable from: 2.77.1-1]
  libglib2.0-bin/mantic 2.77.3-1 amd64 [upgradable from: 2.77.1-1]
  libglib2.0-data/mantic,mantic 2.77.3-1 all [upgradable from: 2.77.1-1]
  xdg-desktop-portal/mantic 1.17.2-1ubuntu1 amd64 [upgradable from: 1.16.0-3ubuntu1]

  Upgrading either glib2.0 or xdg-desktop-portal causes the problem, so
  I don't know exactly which package causes this incompatibility.

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