for (int i = 0, length = next.length(); i < length; i++) {
Style nextClass = next.get(i);
int prevIndex = prev.indexOf(nextClass);
if (prevIndex == -1) {
patches.add(new AddClass(context, nextClass));
}
}
for (int i = 0, length = prev.length(); i < length; i++) {
Style prevClass = prev.get(i);