> a) open the mail account Properties->Receiving Options tab and uncheck the option "Check new messages for Junk content"
That was already unchecked
> b) go to Edit->Preferences->Mail Preferences->Junk tab and disable junk options there.
Here I unchecked "Check incoming messages for junk" and also "Check custom headers for junk"
As I said in the previous mail, I'm now thinking the problem is more likely to be inside Gmail?
I did do:
$ CAMEL_DEBUG=imapx:io evolution
and quickly browsed the outcome - looks like the only mention of "Junk" is as: (NonJunk) (NonJunk \Seen) (NonJunk \Flagged)