Enable document mode on root QTabWidget.

This optimises the scrollbars on the collection listview and the puzzle
table for Fitt's law. Also, the visual clutter of multiple widget
borders is reduced.

svn path=/trunk/KDE/kdegames/palapeli/; revision=1137639

src/window/mainwindow.cpp

@@ -65,6 +65,7 @@ Palapeli::MainWindow::MainWindow(KCmdLineArgs* args)
 	m_centralWidget->addTab(m_puzzleTable, i18nc("General note to translators: There is an important distinction to make between \"puzzle table\" and \"puzzle table area\". The first one is the complete widget with zooming controls, progress bar and all, while the latter is that part of it where pieces can be moved.", "Puzzle table"));
 	m_centralWidget->setTabEnabled(m_centralWidget->indexOf(m_puzzleTable), false); //... until a puzzle has been loaded
 	m_centralWidget->setCurrentWidget(m_collectionWidget);
+	m_centralWidget->setDocumentMode(true);
 	connect(m_collectionWidget, SIGNAL(createRequest()), this, SLOT(createPuzzle()));
 	connect(m_collectionWidget, SIGNAL(playRequest(const QModelIndex&)), this, SLOT(loadPuzzle(const QModelIndex&)));
 	//setup main window