fix for plugins not modifying files' tags

beets/importer.py

@@ -727,6 +727,10 @@ def plugin_stage(config, func):
             continue
         func(config, task)
 
+        # Stage may modify DB, so re-load cached item data.
+        for item in task.imported_items():
+            config.lib.load(item)
+
 def manipulate_files(config):
     """A coroutine (pipeline stage) that performs necessary file
     manipulations *after* items have been added to the library.
@@ -737,7 +741,7 @@ def manipulate_files(config):
         if task.should_skip():
             continue
 
-        # Move/copy files.
+        # Move/copy/write files.
         items = task.imported_items()
         task.old_paths = [item.path for item in items]  # For deletion.
         for item in items:

docs/changelog.rst

@@ -22,6 +22,8 @@ Changelog
 * Add the track mapping dictionary to the ``album_distance`` plugin function.
 * Fix an assertion failure when the MusicBrainz main database and search server
   disagree.
+* Fix a bug that caused the :doc:`/plugins/lastgenre` and other plugins not to
+  modify files' tags even when they successfully change the database.
 
 .. _Tomahawk resolver: http://beets.radbox.org/blog/tomahawk-resolver.html