patch 8.2.4211: window title test still fails in some configurations

Problem:    Window title test still fails in some configurations.
Solution:   Use WaitForAssert().
diff --git a/src/testdir/test_functions.vim b/src/testdir/test_functions.vim
index 39110bb..edd03e3 100644
--- a/src/testdir/test_functions.vim
+++ b/src/testdir/test_functions.vim
@@ -1643,7 +1643,7 @@
   END
   call writefile(lines, 'Xsetbufvar')
   let buf = RunVimInTerminal('-S Xsetbufvar', {})
-  call assert_match('Xa.txt', term_gettitle(buf))
+  call WaitForAssert({-> assert_match('Xa.txt', term_gettitle(buf))}, 1000)
 
   call term_sendkeys(buf, "i\<F2>")
   call TermWait(buf)
diff --git a/src/version.c b/src/version.c
index 5be0473..18d8fc7 100644
--- a/src/version.c
+++ b/src/version.c
@@ -751,6 +751,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    4211,
+/**/
     4210,
 /**/
     4209,