Restore Mac Application Window after Cmd-H

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How to restore an OS X application window after hiding with Cmd-H

If you have hidden an OS X Application with Cmd-H (aka Apple-H = ⌘-H) the hidden window cannot be shown again by calling slot show(). In this case you must call

raise();
// maybe additionally to activate the window:
activateWindow();

If you have installed a system tray icon with "QSystemTrayIcon":http://doc.qt.nokia.com/stable/qsystemtrayicon.html you can add a menu entry and connect the "QAction's":http://doc.qt.nokia.com/stable/qaction.html triggered() signal with the respecitve slots.