\brief Returns the currently-entered selector for an Objective-C message
send, formatted like "initWithFoo:bar:". Only guaranteed to return a
non-empty string for CXCompletionContext_ObjCInstanceMessage and
CXCompletionContext_ObjCClassMessage.
\param Results the code completion results to query
\returns the selector (or partial selector) that has been entered thus far
for an Objective-C message send.
\brief Returns the currently-entered selector for an Objective-C message send, formatted like "initWithFoo:bar:". Only guaranteed to return a non-empty string for CXCompletionContext_ObjCInstanceMessage and CXCompletionContext_ObjCClassMessage.
\param Results the code completion results to query
\returns the selector (or partial selector) that has been entered thus far for an Objective-C message send.