Fix KXmlGUI toolbars; and Konsole MainWindow size
Call setupGUI(), which will call createGUI (since we set the KXmlGuiWindow::Create flag), omit the StatusBar flag since we don't have a statusbar and don't want the "Show StatusBar" menu action.
TabbedViewContainer::sizeHint() calculates an optimum size for itself, including the sizes of its child widgets; added in efb621d0 by Mariusz Glebocki; following the code: MainWindow creates a ViewManager ViewManager creates a TabbedViewContainer and then a TerminalDisplay
which means that the first time TabbedViewContainer::sizeHint() is called the TerminalDisplay widget size is 0, then TabbedViewContainer::sizeHint() would return 0.
Which is why calling resize() in MainWindow was delayed to the showEvent(), (and even delayed more by a QTimer::singleShot() call in Application), at which point all the child widgets have been created and MainWindow::sizeHint() (which logically takes into account the sizeHint() of its child widgets) would return a sensible size.
CCBUG: 430036 CCBUG: 439339 BUG: 436471
(cherry picked from commit 09035666)