QWaylandCompositor outputAdded, Removed & 2 other signals undocumented

The following signals have been a part of the QWaylandCompositor public API since Qt 5.x, and have not been documented.

• outputAdded(QWaylandOutput *output) - qwaylandcompositor.h:144
• outputRemoved(QWaylandOutput *output) - qwaylandcompositor.h:145

[EDIT]

I've actually found two more that are undocumented as well:

• surfaceAboutToBeDestroyed(QWaylandSurface *surface); - qwaylandcompositor.h:136
• subsurfaceChanged(QWaylandSurface *child, QWaylandSurface *parent); - qwaylandcompositor.h:137