This is very confusing. If you pick a file from an inactive project, (say version.h), it can take hours to figure out what went wrong.
It is way better, that before, when only the active project's files were shown
If this is going to change, it should be made an option or the picker dialog should show which project the file is associated with.
Unfortunately it is not easy to add something to this dialog, because it is multipurpose dialog and it is used in several places (CC I think).
Probably it will be easier to append the project name to every line in the list control.
I'll look into it...