QmlJSEditor: Force a semantic rehighlight when a dependency changes.

Since the revision of the current document doesn't change, we don't
get rid of errors due to missing dependencies otherwise.

Reviewed-by: Kai Koehne

src/plugins/qmljseditor/qmljseditor.h

@@ -233,6 +233,7 @@ private slots:
     void renameIdUnderCursor();
 
     void semanticRehighlight();
+    void forceSemanticRehighlight();
     void updateSemanticInfo(const QmlJSEditor::Internal::SemanticInfo &semanticInfo);
 
 protected: