/** compute the index of the last filter to render */
private void updateLastFilterIndex() {
lastFilterIndex = -1;
for (int i = filters.size() - 1; i >= 0 && lastFilterIndex == -1; i--) {
if (filters.get(i).isEnabled()) {
lastFilterIndex = i;
return;
}
}
if (lastFilterIndex == -1) {
cleanup();
}
}
