> But the normal frame which hosts the tooltip is not moved in this
 > scenario.  To reproduce, turn on mouse-avoidance-mode (I used 'jump'
 > as the avoidance technique), then start Dired, and move the mouse to
 > the file name under cursor.  Here, the tooltip appears and immediately
 > disappears, and I see no movement of the "hosting" frame anywhere.

Hmm...  So you think that something like the attached should be
applied?

martin