Layout Improvement: Use TopLeftCorner and BottomLeftCorner for LeftDockWidgetArea

src/mainwindow.cpp

@@ -440,8 +440,11 @@ void MainWindow::init()
     tabifyDockWidget(m_effectStackDock, pCore->bin()->clipPropertiesDock());
     bool firstRun = readOptions();
 
+    // Use the corners for left and right DockWidgetArea
     setCorner(Qt::TopRightCorner, Qt::RightDockWidgetArea);
     setCorner(Qt::BottomRightCorner, Qt::RightDockWidgetArea);
+    setCorner(Qt::TopLeftCorner, Qt::LeftDockWidgetArea);
+    setCorner(Qt::BottomLeftCorner, Qt::LeftDockWidgetArea);
 
     // Build effects menu
     m_effectsMenu = new QMenu(i18n("Add Effect"), this);