Github user Leemoonsoo commented on the pull request:
https://github.com/apache/incubator-zeppelin/pull/168#issuecomment-129127104
I think adding `*` mark for dirty state looks clean and pretty. But hiding
title is i think useful for many cases.
I created few mockups with alternatives to see how it'll look like.
Black star

Gray star

Black dot

Gray dot

Other way is changing color of left vertical bar of code area.

Another alternative is put star only on notebook title, like

or

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