[Xcb] connection issue using xcb in libX11

[Adam Jackson]

On Thu, 2010-04-29 at 13:56 -0700, Josh Triplett wrote:
> On Thu, Apr 29, 2010 at 01:05:48PM -0700, Jeremy Huddleston wrote:
> > Yeah, I agree... but this fallback already exists in the wild.
> 
> I find it quite dubious that real applications expect DISPLAY=:0 to
> connect to TCP.  It certainly violates the principle of least surprise.

Without a transport name, display specifiers are expected to connect to
whatever the best available transport is.  Historically this means magic
local tranports if any, followed by unix sockets, followed by TCP.

So DISPLAY=:0 should connect to TCP if the unix socket doesn't work.

- ajax
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