Fixes assert in QDeclarativeWebView

If QDeclarativeWebView was instantiated twice
an assert was triggered by QWebSettings::enablePersistentStorage();

This patch is crtical for tooling (Bauhaus)

Task-number: QTBUG-14278
Reviewed-by: Aaron Kennedy
(cherry picked from commit f532679ca11914b453e22342f2ae5e9f790ce47a)

1 files changed, 5 insertions, 1 deletions

diff --git a/src/3rdparty/webkit/WebKit/qt/declarative/qdeclarativewebview.cpp b/src/3rdparty/webkit/WebKit/qt/declarative/qdeclarativewebview.cpp
index 94f08bdf02..e4f70deb76 100644
--- a/src/3rdparty/webkit/WebKit/qt/declarative/qdeclarativewebview.cpp
+++ b/src/3rdparty/webkit/WebKit/qt/declarative/qdeclarativewebview.cpp
@@ -249,7 +249,11 @@ void QDeclarativeWebView::init()
 {
     d = new QDeclarativeWebViewPrivate(this);
 
-    QWebSettings::enablePersistentStorage();
+    if (QWebSettings::iconDatabasePath().isNull() &&
+        QWebSettings::globalSettings()->localStoragePath().isNull() &&
+        QWebSettings::offlineStoragePath().isNull() &&
+        QWebSettings::offlineWebApplicationCachePath().isNull()) 
+        QWebSettings::enablePersistentStorage();
 
     setAcceptedMouseButtons(Qt::LeftButton);
     setFlag(QGraphicsItem::ItemHasNoContents, true);