happens when cell selection is enabled with multiple mode

failing test:

    @Test public void selectRowWhenInMultipleCellSelectionModeNotification() {
        model.setSelectionMode(SelectionMode.MULTIPLE);
        model.setCellSelectionEnabled(true);
        model.clearSelection();
        List<Change> changes = new ArrayList<>();
        model.getSelectedIndices().addListener((Change<? extends Integer> c) -> {
            changes.add(c);
            // Note: simple logging points to the reason for the error: 
            // System.out.println(c);
        });
        model.select(1);
        assertEquals("indices must fire single change: ", 1, changes.size());
    }

The underlying reason is ControlUtils.updateSelectedIndices: its task is to map the notifications received from selectedCells to notifications of selectedIndices. It fails by sending multiple notifications for the same row (probably with incorrect to/from coordinates)

Yeah, the change coordinates fired by updateSelectedIndices are definitely wrong:

    // the change originated in selectedCells, coordinates in a flat list
    public static <S> void updateSelectedIndices(MultipleSelectionModelBase<S> sm, ListChangeListener.Change<? extends TablePositionBase<?>> c) {
        sm.selectedIndices._beginChange();

        while (c.next()) {
            // [.. ] do some magic to change the indices under their feet ..

            // error: c.getFrom is in coordinates of the list of cells
            final int to = c.getFrom() ... ;
           // error: mark a change multiple time (for each next)
             if (c.wasReplaced()) {
                sm.selectedIndices._nextReplace(c.getFrom(), to, removed);
            } ... 
        }