QmlDesigner.formEditor: usablity fix

Displaying the bounding Rectangle  makes no sense for small/thin items.

Change-Id: Ia30692e0cfa2641cfe3b4962a2f54f9eafe50201
Reviewed-on: http://codereview.qt-project.org/4984


Reviewed-by: Qt Sanity Bot <qt_sanity_bot@ovi.com>
Reviewed-by: Marco Bubke <marco.bubke@nokia.com>

src/plugins/qmldesigner/components/formeditor/formeditoritem.cpp

@@ -239,6 +239,9 @@ void FormEditorItem::paintBoundingRect(QPainter *painter) const
         || (QGraphicsItem::parentItem() == scene()->formLayerItem() && qFuzzyIsNull(m_borderWidth)))
           return;
 
+     if (boundingRect().width() < 8 || boundingRect().height() < 8)
+         return;
+
     QPen pen;
     pen.setJoinStyle(Qt::MiterJoin);
     pen.setStyle(Qt::DotLine);