When you want to move a toolbar you need to click and drag the toolbar's
selection bar (the vertical bar at the toolbar's left side).
The problem is that the bar is very narrow and sometimes instead of clicking the
bar you end up clicking the icon to the left or to the right of it.
If you had some kind of visual clue that the mouse is over it this would be
avoided and would be more user friendly. It could be done like it is done for
the toolbar's icons be making it popup in 3D.
Created attachment 25461 [details]
Current toolbar implementation is so badly written that we don't want to touch it unless we have to. Your suggestion may
be a part of bigger toolbar rewrite, see http://www.netbeans.org/issues/show_bug.cgi?id=59242