I tried to do some testing on what was scanned with the different options on (scan in open, scan on write/modify, web-scanner etc etc) by turning on the “Show detailed info”. But that didn’t tell me much 
It says “Scanning ” no matter what is done, so I can’t see if a file is scanned when opening, writing, or by the web-scanner
I would like to suggest an option (hidden or in the user-interface) that wuld enable even more detailed info, looking about like this 
Scanning [read]
Scanning [write]
Scanning [web]
Or somthing like that (layout is not important, only that the info is there