bug#17975: 24.3.92; assertion failure deleting frames with varying names for the same display (and, using multiple X11 connections in that case too)

[Ken Raeburn <raeburn@permabit.com>]

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Also -- lest we make any incorrect assumptions about the display names --
some code on Mac OS X sets the $DISPLAY string for the local display to the
full path to a unix-domain socket, the name of which just happens to end
with ":0". I suspect it's a launchd thing, where connecting triggers
launchd to start up the X server and pass data through. But, an
X11-configured Emacs on Mac OS X, run from a Terminal window, may have to
deal with it, so we can't assume it's a host name.​

I'm not sure the different transport matters much, so long as when the user
asks us to connect to the local server, we connect to the local server. But
I don't want to rehash that discussion here, and it doesn't help me much if
using two different displays will trigger the same problem.

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