Hi Andrei - undo for hide/show only works for some of the built in hide/show mechanisms. When a script does its own individual hide/show on a per object level that will not trigger the mechanisms that are needed for the setting up the undo unit.
Currently there is not any way set up for a script to make those particular undo units, sorry. That could be something I could try to work on in the future though.
- Michael
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