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Date: Thu, 13 Dec 2012 20:22:50 -0500
Message-Id: <201212140122.qBE1MoKM019255@envy.delorie.com>
From: DJ Delorie <dj AT delorie DOT com>
To: geda-user AT delorie DOT com
In-reply-to: <172CCAAB-0423-43EF-8A04-5A9961F1D5B9@noqsi.com> (message from
	John Doty on Thu, 13 Dec 2012 18:16:34 -0700)
Subject: Re: [geda-user] Find rat lines
References: <20121204183305 DOT 6b04c0dc AT jive DOT levalinux DOT org> <20121208112649 DOT 388a9d22 AT jive DOT levalinux DOT org> <1355011808 DOT 19390 DOT 8 DOT camel AT localhost> <alpine DOT DEB DOT 2 DOT 00 DOT 1212090407031 DOT 26605 AT igor2priv> <1355188647 DOT 12937 DOT 14 DOT camel AT localhost> <A7B4EDBD-3704-4837-9350-A16559C60A2A AT noqsi DOT com> <201212140010 DOT qBE0ABjV023762 AT envy DOT delorie DOT com> <172CCAAB-0423-43EF-8A04-5A9961F1D5B9 AT noqsi DOT com>
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> To expand on my confusion, I cannot understand how this could be
> difficult

An example of the difficulty: the user selects a region of items on
the pcb and moves them to the other side, or even just moves them
elsewhere.  The simplistic "first touch" netlist ownership method
fails miserably with those simple commands, because a huge number of
connections change simultaneously.

Even something as simple as adding a single trace could "short"
multiple existing subnets, and if some of those subnets have been
assigned to nets but some subnets are as yet unassigned (because they
have yet to connect to something known to be in the netlist), you get
lots of arbitrary choices to be made about how everything needs to be
resolved.