[cp-patches] Fixing item event management in JComboBox

[Meskauskas Audrius]

When changing a selected item, JComboBox always fires two item events. The 
first is the deselection event, notifying, that the previously selected item 
is no longer selected. Next follows the selection event, notifying about the 
currently selected item.

The Mauve test on the events indicates that the Classpath version does not 
fire the deselection event when selecting the item first time after calling 
the constructor. If the JCheckbox is constructed from array or vector of 
items, the first item is selected by default, and the the item listeners 
must be notified that it is deselected.

After focusing on this, I found another bug: after creating JComboBox from 
the array of items, the getSelectedIndex returns -1 (none selected). If the 
array is not empty, it must return 0, the index of the first item, selected 
by default.

The bug can be fixed by adding setSelectedIndex(0) in the two constructors.

Audrius Meskauskas

JComboBox.java.diff
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