Xpra: Ticket #2168: html5 client does not recover from paint errors

Discovered as part of #2167: injecting random errors into the paint code correctly logs the problem both client side and server side (now with the stacktrace), and the server is notified of the decoding error, yet thing aren't reset properly and eventually the server shows:

Warning: timeout on screen updates for window 1,
 already delayed for more than 15 seconds

Fri, 22 Feb 2019 12:28:33 GMT - Antoine Martin: attachment set

patch to trigger errors

Fri, 22 Feb 2019 12:30:24 GMT - Antoine Martin: status changed; resolution set

The fix is in r21806 - triggering this problem is actually almost impossible, so no big deal.

Related improvements in:

Sat, 23 Jan 2021 05:44:01 GMT - migration script:

this ticket has been moved to: https://github.com/Xpra-org/xpra/issues/2168