- * Updates the number of items (= number of directories + number of files)
- * and shows this information in the statusbar.
+ * Updates the number of items (= number of files + number of
+ * directories) in the statusbar. If files are selected, the number
+ * of selected files and the sum of the filesize is shown. The update
+ * is done asynchronously, as getting the sum of the
+ * filesizes can be an expensive operation.
+ * Unless a previous OperationCompletedMessage was set very shortly before
+ * calling this method, it will be overwritten (see DolphinStatusBar::setMessage).
+ * Previous ErrorMessages however are always preserved.