Issue #21827: Fixed textwrap.dedent() for the case when largest common
whitespace is a substring of smallest leading whitespace.
Based on patch by Robert Li.
diff --git a/Misc/ACKS b/Misc/ACKS
index 0c7d7d9..35619ec 100644
--- a/Misc/ACKS
+++ b/Misc/ACKS
@@ -808,6 +808,7 @@
 Mark Levitt
 William Lewis
 Akira Li
+Robert Li
 Xuanji Li
 Robert van Liere
 Ross Light