Make edit / dive add in progress check more consistent

We need to check for this whenever we do something that directly or
indirectly closes the data file. Previously we were missing the straight
"quit". Also, we should consistently check for both editing or dive
addition. And lastly, we should use consistent language with commit
0e9cd0944284 ("Make editing message consistent with button labels").

Signed-off-by: Dirk Hohndel <dirk@hohndel.org>

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