Enable encryption if editing an encrypted draft

This commit is a hack. It assumes that if a draft is encrypted, the user
chose to encrypt at some point and sets the status based on that
assumption. This is only an assumption though, which becomes a problem
e.g. if some other MUA encrypts all drafts. At some point we should
remember the actual user choice.

app/ui/src/main/java/com/fsck/k9/activity/compose/RecipientPresenter.java

@@ -222,6 +222,7 @@ public class RecipientPresenter {
 
     public void initFromDraftMessage(Message message) {
         initRecipientsFromDraftMessage(message);
+        initEncryptionStatus(message);
         initPgpInlineFromDraftMessage(message);
     }
 
@@ -235,6 +236,13 @@ public class RecipientPresenter {
         addBccAddresses(bccRecipients);
     }
 
+    private void initEncryptionStatus(Message message) {
+        boolean isEncryptedDraft = composePgpEnableByDefaultDecider.shouldEncryptByDefault(message);
+        if (isEncryptedDraft) {
+            currentCryptoMode = CryptoMode.CHOICE_ENABLED;
+        }
+    }
+
     private void initPgpInlineFromDraftMessage(Message message) {
         cryptoEnablePgpInline = message.isSet(Flag.X_DRAFT_OPENPGP_INLINE);
     }