Vim: keep result centered within viewport while searching
Vim: keep result centered within viewport while searching

I originally coded this up doing a horrible hack:

- save `scrolloff` value
- set `scrolloff` to 1000
- issue `:normal n` (etc)
- restore `scrolloff` to former value

This however, doesn't center when the result is near the bottom of the
buffer. Good ol' `zz`, however, does[*]. So let's just use that.

[*]: Thanks to http://stackoverflow.com/a/12838570/2103996 for the
reminder.

wincent/wincent,wincent/wincent,wincent/wincent,wincent/wincent,wincent/wincent,wincent/wincent,wincent/wincent,wincent/wincent