QmlDesigner.itemLibrary: use utf8 for filenames (not latin1)

Task-number: QTCREATORBUG-4617
Change-Id: I6ff20816aa2800d4465a99ee69bdd871e6186a57
Reviewed-on: http://codereview.qt.nokia.com/1511Reviewed-by: Qt Sanity Bot <qt_sanity_bot@ovi.com>
Reviewed-by: Thomas Hartmann <Thomas.Hartmann@nokia.com>

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

@@ -379,7 +379,7 @@ void DragTool::dragMoveEvent(QGraphicsSceneDragDropEvent * event)
                 createQmlItemNode(itemLibraryEntry, parentNode, event->scenePos());
             } else if (event->mimeData()->hasFormat("application/vnd.bauhaus.libraryresource")) {
                 Q_ASSERT(!event->mimeData()->data("application/vnd.bauhaus.libraryresource").isEmpty());
-                QString imageName = QString::fromLatin1((event->mimeData()->data("application/vnd.bauhaus.libraryresource")));
+                QString imageName = QString::fromUtf8((event->mimeData()->data("application/vnd.bauhaus.libraryresource")));
                 createQmlItemNodeFromImage(imageName, parentNode, event->scenePos());
             } else Q_ASSERT(false);
             m_blockMove = true;

src/plugins/qmldesigner/components/itemlibrary/itemlibrarycomponents.cpp

@@ -129,7 +129,7 @@ void ItemLibraryTreeView::startDrag(Qt::DropActions /* supportedActions */)
         drag->setPreview(pixmap);
         drag->setPixmap(QIcon(pixmap).pixmap(128, 128));
         QMimeData *mimeData = new QMimeData;
-        mimeData->setData("application/vnd.bauhaus.libraryresource", fileInfo.absoluteFilePath().toLatin1());
+        mimeData->setData("application/vnd.bauhaus.libraryresource", fileInfo.absoluteFilePath().toUtf8());
         drag->setMimeData(mimeData);
         drag->exec();
     }