another variant of incorrect change notification from selectedIndices/Items: doesn't report all of the additions. Below is a failing test snippet (nearly standalone, the complete tests are in MultipleSelectionIssues, as always ;-) for selectedIndices

    /**
     * Test list change of selectedIndices on setIndices. Fails for core ..
     */
    @Test
    public void testEventIndicesOnSelectIndices() {
        if (!multipleMode) return;
        int[] indices = new int[]{2, 5, 7};
        ListChangeListener l = c -> {
            int subChanges = 0;
            while(c.next()) {
                subChanges++;
            }
            assertEquals(1, subChanges);
            c.reset();
            c.next();
            assertEquals(indices.length, c.getAddedSize());
        };
        getSelectionModel().getSelectedIndices().addListener(l);
        getSelectionModel().selectIndices(indices[0], indices);
    }