patch 8.2.0840: search match count wrong when only match is in fold

Problem:    Search match count wrong when only match is in fold.
Solution:   Update search stats when in a closed fold. (Christian Brabandt,
            closes #6160, closes #6152)
diff --git a/src/testdir/test_search_stat.vim b/src/testdir/test_search_stat.vim
index 9bd2404..68d339f 100644
--- a/src/testdir/test_search_stat.vim
+++ b/src/testdir/test_search_stat.vim
@@ -186,6 +186,35 @@
   bwipe!
 endfunc
 
+func Test_search_stat_foldopen()
+  CheckScreendump
+
+  let lines =<< trim END
+    set shortmess-=S
+    setl foldenable foldmethod=indent foldopen-=search
+    call append(0, ['if', "\tfoo", "\tfoo", 'endif'])
+    let @/ = 'foo'
+    call cursor(1,1)
+    norm n
+  END
+  call writefile(lines, 'Xsearchstat1')
+
+  let buf = RunVimInTerminal('-S Xsearchstat1', #{rows: 10})
+  call TermWait(buf)
+  call VerifyScreenDump(buf, 'Test_searchstat_3', {})
+
+  call term_sendkeys(buf, "n")
+  call TermWait(buf)
+  call VerifyScreenDump(buf, 'Test_searchstat_3', {})
+
+  call term_sendkeys(buf, "n")
+  call TermWait(buf)
+  call VerifyScreenDump(buf, 'Test_searchstat_3', {})
+
+  call StopVimInTerminal(buf)
+  call delete('Xsearchstat1')
+endfunc
+
 func! Test_search_stat_screendump()
   CheckScreendump