From 9898ac50e10f427f0950a19bcd43417722f0df81 Mon Sep 17 00:00:00 2001
From: Tim Jenssen <tim.jenssen@digia.com>
Date: Thu, 17 Jul 2014 14:17:55 +0200
Subject: [PATCH] QmlDesigner: fix that an invalid root item refreshes the
 preview

Change-Id: I8d917dfd92261a88472bd49577731f5bcf468d49
Reviewed-by: Marco Bubke <marco.bubke@digia.com>
---
 .../qml2puppet/instances/quickitemnodeinstance.cpp    | 11 +++++++++--
 1 file changed, 9 insertions(+), 2 deletions(-)

diff --git a/share/qtcreator/qml/qmlpuppet/qml2puppet/instances/quickitemnodeinstance.cpp b/share/qtcreator/qml/qmlpuppet/qml2puppet/instances/quickitemnodeinstance.cpp
index 9e100d02650..33931cbd70b 100644
--- a/share/qtcreator/qml/qmlpuppet/qml2puppet/instances/quickitemnodeinstance.cpp
+++ b/share/qtcreator/qml/qmlpuppet/qml2puppet/instances/quickitemnodeinstance.cpp
@@ -392,8 +392,15 @@ QImage QuickItemNodeInstance::renderPreviewImage(const QSize &previewImageSize)
 {
     QRectF previewItemBoundingRect = boundingRect();
 
-    if (previewItemBoundingRect.isValid() && quickItem())
-        return designerSupport()->renderImageForItem(quickItem(), previewItemBoundingRect, previewImageSize);
+    if (previewItemBoundingRect.isValid() && quickItem()) {
+        if (quickItem()->isVisible()) {
+            return designerSupport()->renderImageForItem(quickItem(), previewItemBoundingRect, previewImageSize);
+        } else {
+            QImage transparentImage(previewImageSize, QImage::Format_ARGB32_Premultiplied);
+            transparentImage.fill(Qt::transparent);
+            return transparentImage;
+        }
+    }
 
     return QImage();
 }