I've made max_history_size customizable as user preference.
It defaults to 20 as it was hardcoded up to now.
here's the patch

** Patch added: "max_history_size_as_user_pref.patch"
   http://launchpadlibrarian.net/39069824/max_history_size_as_user_pref.patch

-- 
Undo and Redo Support
https://bugs.launchpad.net/bugs/425460
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Status in OpenShot Video Editor: Fix Committed

Bug description:
I am using version 0.9.2 in ubuntu 9.04 32 bit.

I would like to see a multilevel "undo" feature, so If I make a mistake with 
something, I can go back to where I was.  I tried using a few of the tools and 
suddenly lost a few tracks and other items, so I looked for the undo button and 
tried ctrl-z, but there was no way to go back, so I had to reload the project 
in an earlier saved state.





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