Show contact photo in new message notification

app/src/main/java/eu/faircode/email/ServiceSynchronize.java

@@ -512,13 +512,31 @@ public class ServiceSynchronize extends LifecycleService {
                 if (!TextUtils.isEmpty(message.subject))
                     mbuilder.setContentText(message.subject);
 
-            if (!TextUtils.isEmpty(message.avatar))
+            if (!TextUtils.isEmpty(message.avatar)) {
+                Cursor cursor = null;
+                try {
+                    cursor = getContentResolver().query(
+                            Uri.parse(message.avatar),
+                            new String[]{ContactsContract.Contacts._ID},
+                            null, null, null);
+                    if (cursor.moveToNext()) {
+                        Uri photo = Uri.withAppendedPath(
+                                ContactsContract.Contacts.CONTENT_URI,
+                                cursor.getLong(0) + "/photo");
+                        mbuilder.setLargeIcon(Icon.createWithContentUri(photo));
+                    }
+                } finally {
+                    if (cursor != null)
+                        cursor.close();
+                }
+
                 if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.P)
                     mbuilder.addPerson(new Person.Builder()
                             .setUri(message.avatar)
                             .build());
                 else
                     mbuilder.addPerson(message.avatar);
+            }
 
             if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O)
                 mbuilder.setGroupAlertBehavior(Notification.GROUP_ALERT_CHILDREN);