nemo-list-model: show expander when a previously empty folder gets items

In the same way that we remove the dummy row when we know the folder
doesn't have any items in it, do add one when we know that it does
have items.

Author: gkatev

src/nemo-list-model.c

@@ -1107,6 +1107,9 @@ update_dummy_row (NemoListModel *model,
     got_count = nemo_file_get_directory_item_count (file, &count, &unreadable);
 
     if ((got_count && count == 0) || (!got_count && unreadable)) {
+        /* The directory doesn't have any items in it, so we want to
+         * hide the the expander. Check if there is any dummy entry
+         * (which would force its appearence) and remove it. */
         files = file_entry->files;
         if (g_sequence_get_length (files) == 1) {
             GSequenceIter *dummy_ptr = g_sequence_get_iter_at_pos (files, 0);
@@ -1129,6 +1132,15 @@ update_dummy_row (NemoListModel *model,
                 }
             }
         }
+    } else if (got_count && count > 0) {
+        /* The directory does have items in it. We want an expander present,
+         * so check if there are any entries, and if not add a dummy one. */
+        files = file_entry->files;
+
+        if (g_sequence_get_length (files) == 0) {
+            add_dummy_row(model, file_entry);
+			changed = TRUE;
+		}
     }
 
     file_entry->expanding = FALSE;