Convert to plain text only on reference edit

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

@@ -385,6 +385,9 @@ public interface DaoMessage {
     @Query("UPDATE message SET stored = :stored WHERE id = :id")
     int setMessageStored(long id, long stored);
 
+    @Query("UPDATE message SET plain_only = :plain_only WHERE id = :id")
+    int setMessagePlainOnly(long id, boolean plain_only);
+
     @Query("UPDATE message SET last_attempt = :last_attempt WHERE id = :id")
     int setMessageLastAttempt(long id, long last_attempt);
 

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

@@ -581,11 +581,15 @@ public class FragmentCompose extends FragmentBase {
 
                 refFile.delete();
 
+                db.message().setMessagePlainOnly(draft.id, true);
+
                 return null;
             }
 
             @Override
             protected void onExecuted(Bundle args, Void data) {
+                plain_only = true;
+                getActivity().invalidateOptionsMenu();
                 showDraft(working);
             }