<c-w><space> to open current terminal buffer in a new tab:
tnoremap <c-w><space> <c-w>:tab split<cr>
This map cause
<c-w><c-w> trigger mapping delay in terminal mode, why would that happen? Are there any relation between
<space> (0x20) and
<c-w> (0x17) ?
<c-w><space> works fine, it doesn't trigger mapping delay.
I have created an rc file with this single command and tested it with
vim -Nu rc, the result didn't change.
FWIW, I also use this map in normal mode:
nnoremap <c-w><space> :tab split<cr>
It works fine, it doesn't affect
<c-w><c-w> int normal mode.
I'm using vim8.1-2300, ubuntu 18.04.4, zsh 5.4.2