Xpra: Ticket #2735: pass window content-type to client

Extending #2721.

So the 'content-type' can be used to decide when to enable opengl and when not to.

ie: "text" windows should not use opengl acceleration?

Sat, 18 Apr 2020 15:15:11 GMT - Antoine Martin: status, description changed; resolution set

Done in r26144.

Don't use opengl for text windows: r26145.

Sat, 23 Jan 2021 05:59:21 GMT - migration script:

this ticket has been moved to: https://github.com/Xpra-org/xpra/issues/2735