I'd emulate Ctrl-Space keypress and CLI with Esc using map

I'd like to create a new shortcut key of `F4` to send Esc to vim but Ctrl-space to xterm, gnome-terminal instead of vim.

Seems the command `imap <F4> <Esc> :call feedkeys("\<C-Space>")<CR>` does not send Ctrl-Space.

Do you have any ideas?

I also tried the two commands:

nmap <silent> <F4> :!ibus engine anthy<CR>a
imap <silent> <F5> <Esc>:!ibus engine xkb:us::eng<CR><CR>

They work if I run each command directly in vim buffer. But they do not work if I save them in vimrc.

Do you have any ideas?

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