Simplified search exceptions

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

@@ -353,7 +353,7 @@ public class BoundaryCallbackMessages extends PagedList.BoundaryCallback<TupleMe
         return found;
     }
 
-    private int load_server(final State state) throws MessagingException, IOException {
+    private int load_server(final State state) throws MessagingException, ProtocolException, IOException {
         DB db = DB.getInstance(context);
 
         SharedPreferences prefs = PreferenceManager.getDefaultSharedPreferences(context);
@@ -418,7 +418,8 @@ public class BoundaryCallbackMessages extends PagedList.BoundaryCallback<TupleMe
                     else
                         state.imessages = state.ifolder.search(new AndTerm(and.toArray(new SearchTerm[0])));
                     EntityLog.log(context, "Boundary filter messages=" + state.imessages.length);
-                } else {
+                } else
+                    try {
                         Object result = state.ifolder.doCommand(new IMAPFolder.ProtocolCommand() {
                             @Override
                             public Object doCommand(IMAPProtocol protocol) throws ProtocolException {
@@ -484,6 +485,11 @@ public class BoundaryCallbackMessages extends PagedList.BoundaryCallback<TupleMe
                         });
 
                         state.imessages = (Message[]) result;
+                    } catch (MessagingException ex) {
+                        if (ex.getCause() instanceof ProtocolException)
+                            throw (ProtocolException) ex.getCause();
+                        else
+                            throw ex;
                     }
                 EntityLog.log(context, "Boundary found messages=" + state.imessages.length);