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Date:	Tue, 8 Dec 2015 13:19:11 -0500
Message-Id:	<201512081819.tB8IJBrt022764@envy.delorie.com>
From:	DJ Delorie <dj AT delorie DOT com>
To:	geda-user AT delorie DOT com
In-reply-to:	<B2F4DA99-3254-4C97-A408-854445A09C21@noqsi.com> (message from
	John Doty on Tue, 8 Dec 2015 07:26:29 -1000)
Subject:	Re: [geda-user] gsch2pcb after refdes-renum? (If implemented syncronization detail)
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> We've discussed this many times, and the problem is the unrestricted
> semantics of symbol instance copying.

Is there any research being done on this type of tracking?  Given the
large number of changes that can happen to a schematic between
exports, it seems like you'd have to store the entire history in each
component.  "The NAND gate U5 that was at X,Y in heirarchy A/B/C last
Wednesday is now NOR gate U4 at X2,Y2 in heirarchy E/F/G".  Even a
simple rename is dangerous if you accidentally run it twice.  It seems
to me to be even more complex than merging patches in a big source
tree.

Yet, despite the complexity, it sounds like something users want to be
able to do...

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