The fix for this is included in mutter 3.29.90-1

** Package changed: gnome-shell (Ubuntu) => mutter (Ubuntu)

** Changed in: mutter (Ubuntu)
       Status: In Progress => Fix Committed

** Also affects: gnome-shell (Ubuntu)
   Importance: Undecided
       Status: New

** No longer affects: gnome-shell (Ubuntu Bionic)

** Changed in: gnome-shell (Ubuntu)
       Status: New => Fix Released

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https://bugs.launchpad.net/bugs/1784398

Title:
  Changing monitor settings crashes on
  meta_window_wayland_move_resize_internal

Status in gnome-shell package in Ubuntu:
  Fix Released
Status in mutter package in Ubuntu:
  Fix Committed
Status in mutter source package in Bionic:
  New

Bug description:
  [ Description ]

  Under wayland adding a monitor in cloned mode might crash g-s

  See upstream bug: https://gitlab.gnome.org/GNOME/mutter/issues/248

  [ Test case ]

  Open an Ubuntu session on Wayland:

  1. Attach another monitor
  2. Mark as cloned display
  3. Gnome-shell should not crash

  
  [ Regression potential ]

  Global scale for attached monitors could not be properly computed, and
  thus if attaching an HiDPI device, the UI could not be scaled properly

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