Fix too small height of the carla instrument window (#5829)

src/tracks/InstrumentTrack.cpp

@@ -1551,14 +1551,14 @@ InstrumentTrackWindow::InstrumentTrackWindow( InstrumentTrackView * _itv ) :
 	vlayout->addWidget( m_pianoView );
 	setModel( _itv->model() );
 
-	updateInstrumentView();
-
 	QMdiSubWindow* subWin = gui->mainWindow()->addWindowedWidget( this );
 	Qt::WindowFlags flags = subWin->windowFlags();
 	flags |= Qt::MSWindowsFixedSizeDialogHint;
 	flags &= ~Qt::WindowMaximizeButtonHint;
 	subWin->setWindowFlags( flags );
 
+	updateInstrumentView();
+
 	// Hide the Size and Maximize options from the system menu
 	// since the dialog size is fixed.
 	QMenu * systemMenu = subWin->systemMenu();