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My use case is just that I find it annoying that in the
default mode, you can't run multiple instances, and I kept
seeing the annoying dialog box and having to restart.  I
normally use -n mode partly because of this, but sometimes I
forget.  It seemed like a trivial fix.

Regarding the note, I didn't understand the comment because
it doesn't say why.  I thought maybe it was done that way so
that it could be made to fail so the error messages could be
tested.  It seemed like you avoid the sleep() and several
race conditions by starting the listener first.