Fix problem where the _new_book indication was being lost

src/calibre/devices/kobo/driver.py

@@ -325,8 +325,9 @@ class KOBO(USBMS):
             book = Book(prefix, lpath, '', '', '', '', '', '', other=info)
             if book.size is None:
                 book.size = os.stat(self.normalize_path(path)).st_size
-            book._new_book = True # Must be before add_book
+            b = booklists[blist].add_book(book, replace_metadata=True)
-            booklists[blist].add_book(book, replace_metadata=True)
+            if b:
+                b._new_book = True
         self.report_progress(1.0, _('Adding books to device metadata listing...'))
 
     def contentid_from_path(self, path, ContentType):

src/calibre/devices/prs505/sony_cache.py

@@ -362,6 +362,7 @@ class XMLCache(object):
                 if plugboard is not None:
                     newmi = book.deepcopy_metadata()
                     newmi.template_to_attribute(book, plugboard)
+                    newmi.set('_new_book', getattr(book, '_new_book', False))
                 else:
                     newmi = book
                 (gtz_count, ltz_count, use_tz_var) = \

src/calibre/devices/usbms/books.py

@@ -71,17 +71,21 @@ class BookList(_BookList):
         return False
 
     def add_book(self, book, replace_metadata):
+        '''
+        Add the book to the booklist, if needed. Return None if the book is
+        already there and not updated, otherwise return the book.
+        '''
         try:
             b = self.index(book)
         except (ValueError, IndexError):
             b = None
         if b is None:
             self.append(book)
-            return True
+            return book
         if replace_metadata:
             self[b].smart_update(book, replace_metadata=True)
-            return True
+            return self[b]
-        return False
+        return None
 
     def remove_book(self, book):
         self.remove(book)

src/calibre/devices/usbms/driver.py

@@ -242,8 +242,9 @@ class USBMS(CLI, Device):
             book = self.book_class(prefix, lpath, other=info)
             if book.size is None:
                 book.size = os.stat(self.normalize_path(path)).st_size
-            book._new_book = True # Must be before add_book
+            b = booklists[blist].add_book(book, replace_metadata=True)
-            booklists[blist].add_book(book, replace_metadata=True)
+            if b:
+                b._new_book = True
         self.report_progress(1.0, _('Adding books to device metadata listing...'))
         debug_print('USBMS: finished adding metadata')