Fix document appearing as it is all changed on open

Broken by 113c5600

Apparently SyntaxHighlighter::rehighlight is called too early

Task-number: QTCREATORBUG-10026
Change-Id: Ifa76c156b5b84b79c869d2de1a0ad69c13ac6b48
Reviewed-by: David Schulz <david.schulz@digia.com>

src/plugins/texteditor/plaintexteditor.cpp

@@ -70,7 +70,8 @@ PlainTextEditorWidget::PlainTextEditorWidget(QWidget *parent)
 
     m_commentDefinition.clearCommentStyles();
 
-    connect(editorDocument(), SIGNAL(changed()), this, SLOT(configure()));
+    // If configure() is called immediately the whole document is considered modified
+    connect(editorDocument(), SIGNAL(changed()), this, SLOT(configure()), Qt::QueuedConnection);
     connect(Manager::instance(), SIGNAL(mimeTypesRegistered()), this, SLOT(configure()));
 }