In Motif Look And Feel when we restore a minimized JInternalFrame using double click of mouse it leaves the selection border on desktoppane where the minimized icon was present.

Note: It can take time to reproduce it on some OS and you may need to try more than one time.
It can be easily reproduced on Win2k by exactly following steps given below
Steps to reproduce:
 - Run SwingSet2 demo.
 - Change Look and feel to Motif Look And Feel.
 - Close Frame 0. (So that it don't overlap with minimized icon)
 - Now click on minimize button of Frame 4.
 - Now double click on minimized icon of Frame 4(Double click on the middle of where title "Frame 4" is written on icon).
 - Frame 4 will be restored back and you should see a selection border(focus border) still present there. This border don't go away even if we change the look and feel.

For further reference I have attached two Images
Border1.png : It shows the border left after minimized frame is restored by double click.
Border2.png : It shows the border after the look and feel is changed from Motif to Java
All version of JDK's.