(Sorry for submitting here but the substance-flamingo issue tracker hasn't got
the required components)
Under substance look and feel (i.e. from the demos at
http://www.pushing-pixels.org/?p=500 ), when clicking on an item in the
collapsed gallery view the keyboard focus ring (the dotted border) appears over
the wrong item, generally the item to the right of the clicked item, though not
always as can be seen when choosing an item from the expanded or non-first-line
of the gallery.
Haven't tested under other look and feels.