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Date: Fri, 13 Jul 2012 15:31:58 -0700
From: Colin D Bennett <colin AT gibibit DOT com>
To: geda-user AT delorie DOT com
Subject: Re: [geda-user] Question/advise/suggestion on gschem 'undo'
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On Fri, 13 Jul 2012 21:21:18 +0200
Peter Stuge <peter AT stuge DOT se> wrote:

> John Coppens wrote:
> > To my surprise the number of levels of undo was very limited.
> ..
> > (undo-levels 10)
> ..
> > Are the resources necessary for undo levels so large?
> 
> I would also like to know this.
> 
> 
> > Would it be a problem to have, say, 100 or even 500 undo levels?
> 
> Make that 50000, or simply infinite in a linked list.
> 
> How are actions stored in memory?
> 
> 
> //Peter

It would probably make sense to limit the actual memory consuption
as well.  For instance, the GIMP has the following two items under
Preferences > Environment > Resources Consumption:

  Minimal number of undo level: 5
  Maximum undo memory:          64 megabytes

There are always at least 5 (in this case) undo levels, but as many
as can fit in 64 MB (according to current setting) will be saved.

This is a great solution.

Regards,
Colin