QmlOutline: Prevent warnings about invalid offset for 'setPosition'

Check in advance whether position is still valid. This can be false if
the text has already changed, but the outline hasn't been yet updated.

src/plugins/qmljseditor/qmljsoutline.cpp

@@ -10,6 +10,7 @@
 #include <QtCore/QSettings>
 #include <QtGui/QAction>
 #include <QtGui/QVBoxLayout>
+#include <QtGui/QTextBlock>
 
 using namespace QmlJS;
 
@@ -163,7 +164,6 @@ void QmlJSOutlineWidget::updateSelectionInText(const QItemSelection &selection)
     if (!syncCursor())
         return;
 
-
     if (!selection.indexes().isEmpty()) {
         QModelIndex index = selection.indexes().first();
         QModelIndex sourceIndex = m_filterModel->mapToSource(index);
@@ -173,6 +173,11 @@ void QmlJSOutlineWidget::updateSelectionInText(const QItemSelection &selection)
         if (!location.isValid())
             return;
 
+        const QTextBlock lastBlock = m_editor->document()->lastBlock();
+        const uint textLength = lastBlock.position() + lastBlock.length();
+        if (location.offset >= textLength)
+            return;
+
         Core::EditorManager *editorManager = Core::EditorManager::instance();
         editorManager->cutForwardNavigationHistory();
         editorManager->addCurrentPositionToNavigationHistory();