Lots of operations should not destroy all redo steps

[gmatelich]

I did a boolean operation with keep part turned off, then did a BUNCH of work, and decided I should have kept part. I used undo about 120 steps, saved the parts as a temp file and was horrified to find I'd lost all my redo steps, so could not get back to where I was.

Save_package should not destroy all redo steps

Check part properties without changing any properties should not destroy all redo steps

Please add to the list of things that should not destroy all redo steps, but currently do.

[gmatelich]

Closing a viewport should not destroy all redo steps

[gmatelich]

If I undo and try another operation that fails (for instance add a blend, but it says it couldn't add the blend), I really haven't made any change, so I shouldn't lose my redo steps.