Github user corneadoug commented on the pull request:
https://github.com/apache/incubator-zeppelin/pull/168#issuecomment-127492012
I would say paragraph level since its closer from text editor with changes.
However autosave is more important in itself than the button, and showing the
save button is not needed if there is nothing to change. We could set button at
paragraph level for now, and after use we could move it laterif needed
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