vim:setts: Don't auto-open folds when searching

This makes it a lot easier to restrict the search (besides searching in
visual selection, which is quite limited). The cursor will still land on
the closed fold but only once, independent of the number of hits inside
of the fold.

.config/vim/vimrc.d/30-settings.vim

@@ -110,7 +110,8 @@ set breakindent
 let &showbreak = '\ '
 " Replace concealable characters
 set conceallevel=1
-
+" Do not automatically open folds when searching
+set foldopen-=search
 if (exists('g:loaded_gitgutter'))
 	" Augment the default `foldtext()` with an indicator whether the folded
 	" lines have been changed.