Scenario:

• Create a new box
• Type something
• Wait 3 seconds for the data to be written to disk
• Type something more.

Before this commit, the data would not be written a second time.

You can wait as long as you want at this point, type as much as you want into the box. The graph will never again be written to disk. Not until you create a new box. Every box in a graph contributes exactly one save per session. A graph with n boxes will never be saved more than n times in a single session.

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