merged

Docs/manual.texi:
  Auto merged
sql/ha_myisam.cc:
  Auto merged
mysql-test/t/myisam.test:
  Auto merged
mysql-test/r/myisam.result:
  merged with 'ul'

Docs/manual.texi

@@ -51057,6 +51057,9 @@ not yet 100% confident in this code.
 @appendixsubsec Changes in release 3.23.53
 @itemize @bullet
 @item
+Fixed a bug that @code{OPTIMIZE} of locked and modified MyISAM table,
+reported table corruption.
+@item
 Fixed a @code{BDB}-related @code{ALTER TABLE} bug with dropping a column
 and shutting down immediately thereafter.
 @item