honour --start commands when attaching

[totaam]

Issue migrated from trac ticket # 1931

component: client | priority: major | resolution: fixed

2018-08-06 11:09:45: antoine created the issue

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It should be possible to execute new commands on a remote session when attaching.
This would be even more useful when connecting via the proxy, where the remote sessions can be started empty.

The client should be able to run:

xpra attach --start=xterm

This should work equally well going through a proxy server:

xpra attach ssl://foo:bar@proxyhost/ --start=xterm

[totaam]

2018-08-06 13:45:04: antoine changed status from new to closed

[totaam]

2018-08-06 13:45:04: antoine set resolution to fixed

[totaam]

2018-08-06 13:45:04: antoine edited the issue description

[totaam]

2018-08-06 13:45:04: antoine commented

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Done in r20046.

Note: the server must be started with --start-new-commands=yes.

[totaam]

2018-08-26 21:19:06: antoine commented

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Caused a minor bug: #1940