DK 8.7 face tagging: confirm will trigger a new face scan?

Hi,

I'm a long-time DK user.  I recently upgraded from 8.6 to 8.7 (my system runs 
debian linux) and there seems to be some behaviour change I didn't expect.  I 
wonder if I've got some setting messed up?  

I was using face detect/recognition extensively with DK 8.6.  I didn't modify 
any setting when I began using DK 8.7.  Today I opened the "Unconfirmed" set of 
people tags.  I confirmed a few faces on-by-one.  Then I selected four faces by 
holding shift and left mouse click a range.  When I confirmed those four, a new 
"Face Scanning" run kicked off.

Actually, it might be a timing thing rather than the number of confirmed faces.  
Just now, I did a single one, then waited; about 10 seconds later face 
scanning kicked off again.

Q1: is this new behaviour?  Is it related to some setting I might have 
inadvertently set?  Or a holdover from 8.6->8.7 update?

Q2: the scan takes a minute or two at present.  Is it safe to continue 
confirming faces while it runs?  

Thanks,
-Steve

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