latex: xspace not suppressing space in combination with textit [closed]

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I put xspace at the end of most of my macros, e.g.

\newcommand*{\foobar}{foobar\index{foobar}\xspace}

but I just discovered that if the macro is placed inside textit开发者_开发知识库, it does not work as expected, e.g.

Test 1: \foobar. Test 2: \textit{\foobar}.

produces

Test 1: foobar. Test 2: foobar .

with an extra space before the . character. Of course I could make a duplicate non-xspace macro for these case, but can I fix this more properly in some way?

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I found the answer "hidden" in /usr/share/texmf/doc/latex/tools/xspace.pdf:

Sometimes \xspace may make the wrong decision, and add a space when it is not required. There may be different reasons for this behavior but it can always be handled by following the macro with {}, as this has the effect of suppressing the space.

So

Test 3: \textit{\foobar{}}.

produces

Test 3: foobar.