** Description changed:

  [ Impact]
  
  glib is not aware of snap confinement and this causes the internal logic
  to decide when to use portals to not work as designed. One important
  case is the gsettings backend, which should use a keyfile when confined
  rather than using dconf. When using a fully confined desktop this is
  required, as dconf is not suitable for sharing between snaps.
  
  This has been fixed in glib main:
  https://gitlab.gnome.org/GNOME/glib/-/merge_requests/3020
  
  [ Test Plan ]
+ 
+ (requires a core snap running the updated glib).
  
  1. Install gnome-calculator snap:
  $ snap install gnome-calculator
  2. Disconnect gsettings interface:
  $ snap disconnect gnome-calculator:gsettings
  3. Run gnome-calculator
  4. Change mode from basic to advanced
  5. Close and re-open gnome-calculator
  
  Expected result:
  Mode change remembered on second run. gnome-calculator settings written to 
~/snap/gnome-calculator/current/.config/glib-2.0/settings/keyfile
  
  Observed result:
  Mode change not remembered on second run, errors shown in console about 
accessing dconf:
  (gnome-calculator:1031938): dconf-CRITICAL **: 14:08:56.034: unable to create 
file '/run/user/1000/snap.gnome-calculator/dconf/user': Permission denied.  
dconf will not work properly.
  
  [ Where problems could occur ]
  
  - New bug introduced in glib causing a crash.
  - Security issue introduced in glib due to accessing snapctl.
  - Unexpected behaviour change when running snaps with updated glib.

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https://bugs.launchpad.net/bugs/1998267

Title:
  glib not aware of snap confinement

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