Expose FileManager exclude as a property

lib/tfw/components/source_code_event_handler.py

@@ -9,12 +9,21 @@ log = logging.getLogger(__name__)
 
 
 class FileManager:
-    def __init__(self, working_directory, selected_file=None, exclude=None):
-        self.exclude = exclude if exclude is not None else []
+    def __init__(self, working_directory, selected_file=None, exclude=()):
+        self._exclude = None
+        self.exclude = exclude
         self._workdir = None
         self.workdir = working_directory
         self.filename = selected_file or self.files[0]
 
+    @property
+    def exclude(self):
+        return self._exclude
+
+    @exclude.setter
+    def exclude(self, *exclude):
+        self._exclude = exclude
+
     @property
     def workdir(self):
         return self._workdir