Steve Howell d4fc28cf42 list_cursor: Avoid tracebacks. ...

In rare situations we would get tracebacks from
list_cursor on the line that I changed here.  We
went the entire month of May without a traceback
here, and I can't reproduce the problem.

This is a pretty clear fix, though, and it will
hopefully lead to a more enlightening symptom.

The likely scenario here is that you use `q` to
navigate the stream list and then unsubscribe.
I tested that and couldn't get a traceback,
but I do think the traceback indicates some
possible issues.

The behavior I saw when I did this
appeared to be mostly harmless.
When I deleted a row (by unsubscribing), the code
seemed to effectively disable the cursor.  It's
possible we should go to the next row or fully disable
the search.

I opened #15439 to follow up on this and other
cursor-related issues.

2020-06-18 09:08:46 -07:00

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