Notifications M3 redesign (+ read marker support)

mastodon/src/main/java/org/joinmastodon/android/utils/ObjectIdComparator.java

@@ -0,0 +1,18 @@
+package org.joinmastodon.android.utils;
+
+import java.util.Comparator;
+
+public class ObjectIdComparator implements Comparator<String>{
+	public static final ObjectIdComparator INSTANCE=new ObjectIdComparator();
+
+	@Override
+	public int compare(String o1, String o2){
+		int l1=o1==null ? 0 : o1.length();
+		int l2=o2==null ? 0 : o2.length();
+		if(l1!=l2)
+			return Integer.compare(l1, l2);
+		if(l1==0)
+			return 0;
+		return o1.compareTo(o2);
+	}
+}