black formatting

src/Mod/Material/Gui/MaterialTreeWidget.pyi

@@ -2,11 +2,16 @@
 
 from __future__ import annotations
 
-from Metadata import export, constmethod, forward_declarations, class_declarations, sequence_protocol
+from Metadata import (
+    export,
+    constmethod,
+    forward_declarations,
+    class_declarations,
+    sequence_protocol,
+)
 from Base.BaseClass import BaseClass
 from typing import Final, overload
 
-
 @export(
     Twin="MaterialTreeWidget",
     TwinPointer="MaterialTreeWidget",