fix(compose-auto-complete): check if the animator is null before doing animations

Fixes #591 #564 #517 #434 #328

mastodon/src/main/java/org/joinmastodon/android/ui/utils/UiUtils.java

@@ -1008,6 +1008,9 @@ public class UiUtils {
 	}
 
 	public static <T> void updateList(List<T> oldList, List<T> newList, RecyclerView list, RecyclerView.Adapter<?> adapter, BiPredicate<T, T> areItemsSame) {
+		RecyclerView.ItemAnimator animator=list.getItemAnimator();
+		if(animator!=null)
+			animator.endAnimations();
 		// Save topmost item position and offset because for some reason RecyclerView would scroll the list to weird places when you insert items at the top
 		int topItem, topItemOffset;
 		if (list.getChildCount() == 0) {