On Tue, Dec 17, 2013 at 9:05 AM, Pascal Obry <pas...@obry.net> wrote:
>
> During a teaching session on dt a user got caught by this:
>
> - select a point in history (to watch the evolution)
> - leave darkroom and go to lighttable
>
> The dev history above the last selected point is lost.
>
> Looks like a dangerous behavior to me. Has this been done on purpose?

The problem is that we are using history stack as an undo, which is
not the intended purpose. The same happens if you are looking at a
previous step of an image and you move a slider unadvertedly.

> My proposal would be to remove the history only when clicking on the
> [compress history stack] button.

I basically would agree. Imposes more steps to discard history, but
stays on the safe side.

Also, I would like to have a separate undo stack, in which all changes
to every slider are tracked. This is something I have discussed with
Johannes before. He says that our history module would do it by just
changing one define, but I still think we need some tweaking. Also I
am not sure that it makes sense to store in the XMP all the processing
history stack, which would happen in this case.

-- 
José Carlos García Sogo
   jcs...@gmail.com

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