it should already be done and works for me - you are refering to when the now playing panel is docked in the left navigator bar?
Nope I mean the the Navigator Panel Playing/Selected Tracks. But as you say it works for you I looked again, and there are some strange situations.
Tests done with playing album = selected album for simplicity:
a) In Navigator Panel toggle Playing Tracks/Selected Tracks -> dimension appears in both pictures. BUT:
Playing Track shows 298x230 (correct) and Selected Tracks Show 174x174 (incorrect). When doing Track Editor->Search Internet the 174x174 is the size of the only available picture on for this album .
b) Now, with Selected Tracks chosen, in Main Panel click on the album -> the image takes a little while to change, the "new" image is noticeable different and is shown without the dimensions -> First image is the net one and second is from the album?
Edit: Now Playing->Playing/Selected Tracks has the same behaviour.