Example code showing weird focus bug

The following two multi-column-list-panels behave
differently in response to the tab key.  The tab key
causes the first one to get stuck, so the arrow keys
no longer work, unless you use the mouse to put the
list back in focus.  The tab key has no effect at all
on the second one.

(contain
 (make-instance
  'multi-column-list-panel
  :columns '((:title abc :width 100))
  :items '((a) (b) (c))))

(contain
 (make-instance
  'multi-column-list-panel
  :columns '((:width 100))
  :items '((a) (b) (c))))

In the first one, does the tab key cause the focus to
go to the header and get stuck there?  But if I click
the header instead of using the tab key, the focus is
still in the list.  Can anyone explain what's
happening?

Does this only happen in LWW?


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