Clang: Provide highlighting for identifier under cursor

Change-Id: I80ffe23cbcc84ab7323124581d9dd6afbe974fd0
Reviewed-by: Marco Bubke <marco.bubke@qt.io>

src/plugins/cppeditor/cppuseselectionsupdater.cpp

@@ -105,7 +105,11 @@ void CppUseSelectionsUpdater::update(CallType callType)
         m_runnerWatcher->setFuture(cppEditorDocument->cursorInfo(params));
     } else { // synchronous case
         QFuture<CursorInfo> future = cppEditorDocument->cursorInfo(params);
-        future.waitForFinished();
+
+        // QFuture::waitForFinished seems to block completely, not even
+        // allowing to process events from QLocalSocket.
+        while (!future.isFinished())
+            QCoreApplication::processEvents(QEventLoop::ExcludeUserInputEvents);
 
         processResults(future.result());
     }