Merge pull request #184 from heuer/issue_183_toplevel_parent

XdgTopLevel: Don't check parent pointer against None but ffi.NULL

wlroots/wlr_types/xdg_shell.py

@@ -276,7 +276,7 @@ def __init__(self, ptr) -> None:
     def parent(self) -> XdgTopLevel | None:
         """The parent of this toplevel"""
         parent_ptr = self._ptr.parent
-        if parent_ptr is None:
+        if parent_ptr == ffi.NULL:
             return None
         return XdgTopLevel(parent_ptr)