Delete junk contacts

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

@@ -653,6 +653,17 @@ class Core {
             }
             ifolder.expunge();
         }
+
+        // Delete junk contacts
+        if (EntityFolder.JUNK.equals(target.type)) {
+            Address[] recipients = (message.reply != null ? message.reply : message.from);
+            if (recipients != null)
+                for (Address recipient : recipients) {
+                    String email = ((InternetAddress) recipient).getAddress();
+                    int count = db.contact().deleteContact(target.account, EntityContact.TYPE_FROM, email);
+                    Log.i("Deleted contact email=" + email + " count=" + count);
+                }
+        }
     }
 
     private static void onDelete(Context context, JSONArray jargs, EntityFolder folder, EntityMessage message, IMAPFolder ifolder) throws MessagingException {

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

@@ -79,6 +79,12 @@ public interface DaoContact {
     @Query("DELETE FROM contact WHERE id = :id")
     int deleteContact(long id);
 
+    @Query("DELETE FROM contact" +
+            " WHERE account = :account" +
+            " AND type = :type" +
+            " AND email = :email")
+    int deleteContact(long account, int type, String email);
+
     @Query("UPDATE contact SET state = :state WHERE id = :id")
     int setContactState(long id, int state);