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remote-viewer silently exits if qemu spice/vnc server closes connection.
This seriously confuses users. As they do not know the what have happened.

It would be fine a have pop-up message with a message something like:

"You were disconnected from virtual machine."

+ A reason (optionally): lost connection, qemu crashed, etc...

+ Button: OK

If the server crashes than it probably cannot send a message to the client with the reason of dropping the connection.
Disconnecting by another client - it is easy to prevent by setting a password
Disconnecting because the shutdown - I believe a pop up saying "You have turned off your VM" is not very useful

Maybe I miss some useful usecase - feel free to reopen with it.