When I drag a footprint over another, sometimes the overlap turns the unmoved footprint red.
This is great.
Other footprints, however, make no such display, such as below,
where the connector turns ref but the surface mount cap and IC do not:
I know that it’s not just the first item which lights up; see below,
where a surface mount resistor and resistor array both light up:
.
Is this a bug; is something missing in the footprints of the unlit items?