vim-patch:8.1.0060: crash when autocommands delete the current buffer

Problem:    Crash when autocommands delete the current buffer. (Dominique
            Pelle)
Solution:   Check that autocommands don't change the buffer.
600323b4ef

src/nvim/testdir/test_quickfix.vim

@@ -3360,3 +3360,15 @@ func Test_vimgrep_autocmd()
   call delete('Xtest2.txt')
   call setqflist([], 'f')
 endfunc
+
+func Test_lbuffer_with_bwipe()
+  new
+  new
+  augroup nasty
+    au * * bwipe
+  augroup END
+  lbuffer
+  augroup nasty
+    au!
+  augroup END
+endfunc