Patch Set 6:

* I've fixed repository ordering issue
* this seams to be an issue in jface implementation of used widget. Currently I see only two workarounds for this issue, first is to extend org.eclipse.jface.viewers.AbstractComboBoxCellEditor and copy all source code from org.eclipse.jface.viewers.ComboBoxCellEditor and then add required functionality. Or we could extend org.eclipse.jface.viewers.ComboBoxCellEditor and using reflection obtain instance of package comboBox field and then add required implementation
* I don't have any idea how we could solve this issue since jface/swt doesn't solves it for us.