QDockWidget emits visibilityChanged(false) when minimizing the window or switching virtual desktops

Minimizing the window, or switching virtual desktops leads to UnmapNotify (on X11) which hides the toplevel window, which calls this code in qdockwidget.cpp:

case QEvent::Hide:
if (layout != 0)
layout->keepSize(this);
d->toggleViewAction->setChecked(false);
emit visibilityChanged(false);
break;

If the app connects visibilityChanged(false) to a slot which toggles a QAction, then the dockwidget will not be shown again when switching back to the virtual desktop where the app is.

I think there's a missing check for event->spontaneous() in that code?