When running the GNOME Wayland session dragging gnome-terminal windows from one workspace to the next or between monitors in overview mode causes a fatal lockup that requires a hard-reboot, pressing the power-button.

Device: T430
Graphics: Intel HD 4000.
Kernel: 4.1.4-200.fc22.x86_64
Mutter: 3.16.3
Terminal: 3.16.2

Steps to reproduce:
1. Run a dual monitor setup with external monitor as the Primary.
2. Start working for a while with a terminal in any workspace/monitor.
3. Trigger Activities and drag gnome-terminal window from one workspace/monitor to the next.

Result:
GNOME Shell totally locks up and cannot access TTY's.  Clock still moves in the panel and the mouse can still be moved around but is stuck with the move-window icon, it just doesn't do anything.  System is totally unresponsive and requires a full power-cycle.

No log entries are produced when this happens but I do see this a few minutes leading up to the event:

---
/usr/libexec/gdm-wayland-session[1808]: Activating service name='org.gnome.Terminal'
/usr/libexec/gdm-wayland-session[1808]: Successfully activated service 'org.gnome.Terminal'
org.gnome.Terminal[1811]: (gnome-terminal-server:4150): Gdk-CRITICAL **: gdk_device_get_window_at_position_double: assertion 'GDK_IS_DEVICE (device)' failed
org.gnome.Terminal[1811]: (gnome-terminal-server:4150): Gdk-CRITICAL **: gdk_window_get_toplevel: assertion 'GDK_IS_WINDOW (window)' failed
org.gnome.Terminal[1811]: (gnome-terminal-server:4150): Gdk-CRITICAL **: gdk_window_get_device_position_double: assertion 'GDK_IS_WINDOW (window)' failed
(...)
gnome-session[1813]: Window manager warning: last_user_time (5618808) is greater than comparison timestamp (5618802).  This most likely represents a buggy client 
gnome-session[1813]: Window manager warning: 0x1200001 (bash - Res) appears to be one of the offending windows with a timestamp of 5618808.  Working around...
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