CppEditor: Updating local uses before matching quick fixes

This is necessary since invoking the context menu changes the cursor
position, on which the local uses and some refactoring actions depend.

Change-Id: I32563085bfb106f754992704e569915b9ee5b127
Task-number: QTCREATORBUG-13388
Reviewed-by: Joerg Bornemann <joerg.bornemann@theqtcompany.com>
Reviewed-by: Erik Verbruggen <erik.verbruggen@theqtcompany.com>
Reviewed-by: Eike Ziller <eike.ziller@theqtcompany.com>

src/plugins/cppeditor/cppeditor.cpp

@@ -496,7 +496,8 @@ void CppEditorWidget::contextMenuEvent(QContextMenuEvent *e)
 
     QSignalMapper mapper;
     connect(&mapper, SIGNAL(mapped(int)), this, SLOT(performQuickFix(int)));
-    if (isSemanticInfoValid()) {
+    if (isSemanticInfoValidExceptLocalUses()) {
+        d->m_useSelectionsUpdater.update(CppUseSelectionsUpdater::Synchronous);
         AssistInterface *interface = createAssistInterface(QuickFix, ExplicitlyInvoked);
         if (interface) {
             QScopedPointer<IAssistProcessor> processor(