patch 8.0.1817: a timer may change v:count unexpectedly commit https://github.com/vim/vim/commit/b0f42ba60d9e6d101d103421ba0c351811615c15 Author: Bram Moolenaar <Bram@vim.org> Date: Sat May 12 15:38:26 2018 +0200 patch 8.0.1817: a timer may change v:count unexpectedly Problem: A timer may change v:count unexpectedly. Solution: Save and restore v:count and similar variables when a timer callback is invoked. (closes #2897)

" Test feedkeys() function.

func Test_feedkeys_x_with_empty_string()
  new
  call feedkeys("ifoo\<Esc>")
  call assert_equal('', getline('.'))
  call feedkeys('', 'x')
  call assert_equal('foo', getline('.'))

  " check it goes back to normal mode immediately.
  call feedkeys('i', 'x')
  call assert_equal('foo', getline('.'))
  quit!
endfunc