I'm not sure how compliant you're aiming to be with vim, but the `f`
behavior is more useful when it can search on multiple lines instead of
a single one, so I'd like to propose this change.
This change is quite frequent in vim/neovim as a plugin (e.g.
[clever-f](https://github.com/VSCodeVim/Vim),
[improved-ft](https://github.com/backdround/improved-ft.nvim), etc), and
in other vim emulations (e.g.
[vscode-vim](https://github.com/VSCodeVim/Vim)).
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