Fixed decrypting attachments

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

@@ -1312,11 +1312,14 @@ public class ActivityView extends ActivityBilling implements FragmentManager.OnB
                                         db.attachment().deleteAttachment(a.id);
 
                                 // Add decrypted attachments
+                                attachments = parts.getAttachments();
                                 int sequence = db.attachment().getAttachmentSequence(id);
-                                for (EntityAttachment a : parts.getAttachments()) {
+                                for (int index = 0; index < attachments.size(); index++) {
+                                    EntityAttachment a = attachments.get(index);
                                     a.message = id;
                                     a.sequence = ++sequence;
                                     a.id = db.attachment().insertAttachment(a);
+                                    parts.downloadAttachment(context, index, a.id);
                                 }
 
                                 db.message().setMessageStored(id, new Date().getTime());

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

@@ -675,7 +675,7 @@ class Core {
         // Download attachment
         MessageHelper helper = new MessageHelper((MimeMessage) imessage);
         MessageHelper.MessageParts parts = helper.getMessageParts();
-        parts.downloadAttachment(context, db, attachment.id, sequence);
+        parts.downloadAttachment(context, sequence - 1, attachment.id);
     }
 
     private static long append(IMAPStore istore, IMAPFolder ifolder, MimeMessage imessage) throws MessagingException {
@@ -1411,7 +1411,7 @@ class Core {
             for (EntityAttachment attachment : attachments)
                 if (!attachment.available)
                     if (!metered || (attachment.size != null && attachment.size < maxSize))
-                        if (!parts.downloadAttachment(context, db, attachment.id, attachment.sequence))
+                        if (!parts.downloadAttachment(context, attachment.sequence - 1, attachment.id))
                             break;
         }
     }

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

@@ -691,18 +691,20 @@ public class MessageHelper {
             return result;
         }
 
-        boolean downloadAttachment(Context context, DB db, long id, int sequence) throws IOException {
+        boolean downloadAttachment(Context context, int index, long id) {
+            Log.i("downloading attchment id=" + id + " seq=" + index);
             // Attachments of drafts might not have been uploaded yet
-            if (sequence > attachments.size()) {
-                Log.w("Attachment unavailable sequence=" + sequence + " size=" + attachments.size());
+            if (index > attachments.size()) {
+                Log.w("Attachment unavailable sequence=" + index + " size=" + attachments.size());
                 return false;
             }
 
             // Get data
-            AttachmentPart apart = attachments.get(sequence - 1);
+            AttachmentPart apart = attachments.get(index);
             File file = EntityAttachment.getFile(context, id);
 
             // Download attachment
+            DB db = DB.getInstance(context);
             db.attachment().setProgress(id, null);
             try (InputStream is = apart.part.getInputStream()) {
                 long size = 0;