Bad interaction between guioptions=! and TerminalOpen

When external commands are executed in a terminal window and a TerminalOpen autocommand is defined, the command may affect the current window.

To Reproduce

1. Run mvim -N -i NONE -u vimrc where vimrc has the following content:

  set number
  autocmd TerminalOpen * set nonumber
  set guioptions=!

3. Type :!ls (or any other :! command)
4. You should see the line numbers have disappeared from the current window.

I am expecting that the external command is executed in a different window, hence options set in the terminal window shouldn't affect the current window, as is the case if you remove ! from guioptions.

• Vim 8.1.950
• OS: macOS 10.14
• Terminal: GUI

使用提供的 vimrc 和 :!ls 重现该问题，然后跟踪 guioptions=! 如何创建或使用终端窗口，以及 TerminalOpen autocommand 如何应用。完成的标准是 autocommand 只更改终端窗口，同时保持当前窗口的行号启用；验证 guioptions=! 和不带 ! 的对照情况。