Context:
- muliple selectionMode with multiple indices selected
- select item that's not in the list
- add selected item to list
- expected after insert: selectedItem unchanged, selectedIndex = indexOf(selectedItem)
- actual: selectedIndex is expected +1, selectedItem changed to one after expected item

(TableView misbehaves similarly, only the offset seems to be 2 vs. 1 for ListView)

Below is a failing test. Debugging points to updating selectedIndex from two parts of the code.


    /**
     * Rinse with multiple indices selected.<p>
     *
     * fails due to competing handling of Change:
     * <li> in itemsContentListener falls into block where the index is updated
     * to the index position of the item
     * <li> in updateSelection the wasAdded-block shifts the selectedIndex, thus
     * shifting away from the already correct index
     * <p>
     * best would be to not separate out both - just let selectionChanged handle all
     * then analyse each block whether or not it requires further action
     *
     */
    @Test
    public void testSelectedOnInsertUncontainedMultiple() {
        if (!multipleMode)
            return;
        Object uncontained = "uncontained";
        // prepare state, select a range
        int start = 3;
        int end = 5;
        getSelectionModel().selectRange(start, end);
        getSelectionModel().select(uncontained);
        assertEquals("sanity: having uncontained selectedItem", uncontained,
                getSelectionModel().getSelectedItem());
        assertEquals("sanity: selected index removed ", -1, getSelectionModel()
                .getSelectedIndex());
        // insert uncontained to items
        int insertIndex = 3;
        items.add(insertIndex, uncontained);
        assertEquals("selectedItem unchanged", uncontained,
                getSelectionModel().getSelectedItem());
        assertEquals("selectedIndex updated", insertIndex, getSelectionModel()
                .getSelectedIndex());
    }