// runnable can be a func(O o) {} receving the selected item
static JList onDoubleClickThreaded(final JList list, final O r) {
  ret onDoubleClick(list, voidfunc(fS item) { thread-messagebox { callF(r, item); }});
}

// runnable can be a func(O o) {} receving the selected row index
static JTable onDoubleClickThreaded(final JTable table, final O r) {
  ret onDoubleClick(table, voidfunc(final int row) { thread-messagebox { callF(r, row); }});
}

Began life as a copy of #1003586