patch 8.2.3476: renaming a buffer on startup may cause using freed memory Commit: https://github.com/vim/vim/commit/d3710cf01ef6ab1b2f233866ff01dab76686f642 Author: Bram Moolenaar <Bram@vim.org> Date: Mon Oct 4 23:13:13 2021 +0100 patch 8.2.3476: renaming a buffer on startup may cause using freed memory Problem: Renaming a buffer on startup may cause using freed memory. Solution: Check if the buffer is used in a window. (closes https://github.com/vim/vim/issues/8955)

" Tests for 'ballooneval' in the GUI.

source check.vim
CheckGui
CheckFeature balloon_eval

func Test_balloon_show_gui()
  let msg = 'this this this this'
  call balloon_show(msg)
  call assert_equal(msg, balloon_gettext())
  sleep 10m
  call balloon_show('')

  let msg = 'that that'
  eval msg->balloon_show()
  call assert_equal(msg, balloon_gettext())
  sleep 10m
  call balloon_show('')
endfunc

" vim: shiftwidth=2 sts=2 expandtab