Fixed thumbnail reload on metadata change

metadatamanager.py

@@ -16,6 +16,9 @@ try:
 except ImportError:
     exiv2 = None
     HAVE_EXIV2 = False
+
+_app_modified_callback = None
+
 from utils import preserve_mtime
 from constants import RATING_XATTR_NAME, XATTR_NAME
 
@@ -23,6 +26,15 @@ MetadataResult = collections.namedtuple('MetadataResult', ['tags', 'rating'])
 EMPTY_METADATA = MetadataResult([], 0)
 
 
+def set_app_modified_callback(callback):
+    global _app_modified_callback
+    _app_modified_callback = callback
+
+def mark_app_modified(path):
+    """Triggers the application-modified callback for a path."""
+    if _app_modified_callback:
+        _app_modified_callback(path)
+
 def notify_baloo(path):
     """
     Notifies the Baloo file indexer about a file change using DBus.
@@ -148,6 +160,7 @@ class XattrManager:
             return
         try:
             with preserve_mtime(file_path):
+                mark_app_modified(file_path)
                 if value:
                     os.setxattr(file_path, attr_name, str(value).encode('utf-8'))
                 else: