This commit fixes 2 bugs at once:
1. Correctly trim surround with closing brackets motion, e.g.: `cs()`.
It should trim all surrounding white space or leave things unchanged if
there's no space.
For example cases like these:
"( ${c}foo )" // single spaces
"( ${c}foo )" // multiple spaces
"( ${c}foo)" // assymetric spaces
"(${c} )" // single space without text
"(${c} )" // multiple spaces without text
Should trim white spaces into these results accordingly:
"${c}(foo)"
"${c}(foo)"
"${c}(foo)"
"${c}()"
"${c}()"
In case of no spaces - they should be left unchanged, e.g.:
"(${c}foo)" // no spaces around the word
"(${c})" // empty parenthesis
2. Leave empty parenthesis unchanged. IdeaVim now deleted them instead.
