content-assist for annotation attributes doesn't work when spaces are involved

[martinlippert]

Content-assist for Spring annotation attributes fail when there is a space involved, e.g.

@Resource(name = <*>)

does not show content-assist for @Resource, whereas

@Resource(name =<*>)

does show the correct content-assist proposals. This is a general problem of the content-assist for annotation attributes, not just for the @Resource annotation.

[martinlippert]

Fixed with 5836f41.