guess initial server display resolution

[totaam]

At the moment, we just hardcode some sensible defaults:

xpra/xpra/x11/vfb_util.py

Lines 70 to 84 in 1a664ad

	def parse_env_resolutions(envkey="XPRA_DEFAULT_VFB_RESOLUTIONS",
	single_envkey="XPRA_DEFAULT_VFB_RESOLUTION",
	default_res="8192x4096",
	default_refresh_rate=DEFAULT_REFRESH_RATE//1000):
	s = os.environ.get(envkey)
	if s:
	return parse_resolutions(s, default_refresh_rate)
	return (parse_resolution(os.environ.get(single_envkey, default_res), default_refresh_rate), )
	def get_desktop_vfb_resolutions(default_refresh_rate=DEFAULT_REFRESH_RATE//1000):
	return parse_env_resolutions("XPRA_DEFAULT_DESKTOP_VFB_RESOLUTIONS",
	"XPRA_DEFAULT_DESKTOP_VFB_RESOLUTION",
	"1280x1024",
	default_refresh_rate=default_refresh_rate)

And if we're going to attach locally, we take a shortcut and set the resolution to match that of the current desktop session:
acd37f3

But we could also use the current resolution every time a session is started from an existing desktop session, because chances are that the user will connect locally, and if not this guess is as good as any.

[totaam]

Done in fe1b17c