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Everytime I do this:
:%s/```sh/```ctags/gc
I end up with hidden code blocks at the bottom of the screen that I can't see. I tried 'zz' but it does not work. I did read this and this but that's for normal searching. I don't know what mode I'm in when I'm in search and replace ':' to be able to use getcmdtype() ?
I tried this as well??
cnoremap <expr> n getcmdtype() =~ '[@-=:]' ? 'nzz' : 'n'
I think there is no good way to do what you want. However a work around could be to set scrolloff to a very large number like 999 before you start your substitution.
From :h 'scrolloff':
'scrolloff' 'so' number (default 0)
Minimal number of screen lines to keep above and below the cursor.
This will make some context visible around where you are working. If
you set it to a very large value (999) the cursor line will always be
in the middle of the window (except at the start or end of the file or
when long lines wrap).
This way each time you press n after a substitution the line will be in the middle of the screen.
cnoremap <expr> n getcmdline() =~ '\vs\/.*gc$' ? 'yes' : 'no'. I think an autocommand might work better to turn it off and on but you answer is right.
:h autocmd-events maybe you can make something with :h CmdlineLeave, checking for the last command and if it was a substitution you can reset scrolloff
Ctrl-Yto scroll the screen down andCtrl-Eto scroll the screen up in the:s/.../.../gcconfirmation dialog