This is needed to support addToken_ workaround before the fix.
Before the fix, an extra space was needed in the selector like this
example:
addToken "form.foo "
With the fix adding the missing space, code already adding a space
will end up with two spaces between the scope selector and the input one :
form.foo input[name=token_]
The fix can add spaces in place where none or only one where expected.
The css parser has been modified to remove trailing or multiple spaces.
This might be a bit more lax that official CSS spec.
