fix: background_visible, root_document_visible can be None in SceneInfo

src/rmscene/scene_stream.py

@@ -141,15 +141,15 @@ def version_info(self, _) -> tuple[int, int]:
         return (0, 1)
 
     current_layer: LwwValue[CrdtId]
-    background_visible: LwwValue[bool]
-    root_document_visible: LwwValue[bool]
+    background_visible: tp.Optional[LwwValue[bool]]
+    root_document_visible: tp.Optional[LwwValue[bool]]
     paper_size: tp.Optional[tuple[int, int]]
 
     @classmethod
     def from_stream(cls, stream: TaggedBlockReader) -> SceneInfo:
         current_layer = stream.read_lww_id(1)
-        background_visible = stream.read_lww_bool(2)
-        root_document_visible = stream.read_lww_bool(3)
+        background_visible = stream.read_lww_bool(2) if stream.bytes_remaining_in_block() > 0 else None
+        root_document_visible = stream.read_lww_bool(3) if stream.bytes_remaining_in_block() > 0 else None
         paper_size = stream.read_int_pair(5) if stream.bytes_remaining_in_block() > 0 else None
 
         return SceneInfo(current_layer=current_layer,
@@ -159,8 +159,11 @@ def from_stream(cls, stream: TaggedBlockReader) -> SceneInfo:
 
     def to_stream(self, writer: TaggedBlockWriter):
         writer.write_lww_id(1, self.current_layer)
+        if not self.background_visible: return
         writer.write_lww_bool(2, self.background_visible)
+        if not self.root_document_visible: return
         writer.write_lww_bool(3, self.root_document_visible)
+        if not self.paper_size: return
         writer.write_int_pair(5, self.paper_size)