Surrounding with \( adds no space before, but one space in the middle of, the closing \)

[hugonobrega]

With this visually-selected, calling M-x evil-surround-region \( transforms it into \( this\ ), as opposed to the expected \( this \).

In contrast, M-x evil-surround-region \) gives \(this\) as expected.

Tested on evil-surround 346d4d8