Suppose a file contains the strings "foo", "foo_this" and "foo_that".
You search for something beginning with "foo": press Ctrl+K H, type foo, and then press TAB.
The autocomplete suggestions appear at the bottom of the window like:
foo foo_that foo_this
Find (^K H for help) [prev_stuff]: foo
It's hard for my eyes to quickly spot how where "foo that foo this" splits into words and where it doesn't, i.e. quickly distinguish underlines from spaces, especially if there's a line of text underneath.
It would be great if autocomplete suggestions had at least 2 spaces between them, this would make it much faster to spot the boundaries between suggestions.