Xpra: Ticket #2111: detect nvenc context limit

See ticket:2022#comment:35. We ought to be able to detect that we're dealing with a limited consumer card and auto-tune the heuristics for the 2 context limit. Maybe even just doing it on startup: just try to create 3 contexts? This value should be per-card.

Wed, 20 Mar 2019 05:06:15 GMT - Antoine Martin: milestone changed

Milestone renamed

Sun, 10 May 2020 07:19:32 GMT - Antoine Martin: status, component, milestone changed

Sun, 04 Oct 2020 13:03:33 GMT - Antoine Martin: milestone changed

Sat, 23 Jan 2021 05:42:30 GMT - migration script:

this ticket has been moved to: https://github.com/Xpra-org/xpra/issues/2111