patch 8.2.4018: ml_get error when win_execute redraws with Visual selection

Problem:    ml_get error when win_execute redraws with Visual selection.
Solution:   Disable Visual area temporarily. (closes #9479)
diff --git a/src/testdir/test_execute_func.vim b/src/testdir/test_execute_func.vim
index 9146504..0ca31cb 100644
--- a/src/testdir/test_execute_func.vim
+++ b/src/testdir/test_execute_func.vim
@@ -149,6 +149,16 @@
   unlet xyz
 endfunc
 
+func Test_win_execute_visual_redraw()
+  call setline(1, ['a', 'b', 'c'])
+  new
+  wincmd p
+  call feedkeys("G\<C-V>", 'txn')
+  call win_execute(winnr('#')->win_getid(), 'redraw')
+  bwipe!
+  bwipe!
+endfunc
+
 func Test_win_execute_on_startup()
   CheckRunVimInTerminal