QWaylandQuickItem: Invoke handleSubsurfaceAdded also with QVariant

Docs for WaylandQuickItem subsurfaceHandler suggest you use it like so:

subsurfaceHandler: QtObject {
    function handleSubsurfaceAdded(child) {
        ...
    }
}

However, as far as C++ is concerned all arguments of a JavaScript
function are QVariant, so the type-specific invocation fails.

Change-Id: I2d1a32bef5b30099cf34edc8a9e50b42fb26f217
Reviewed-by: Eskil Abrahamsen Blomfeldt <eskil.abrahamsen-blomfeldt@qt.io>

1 files changed, 4 insertions, 0 deletions

diff --git a/src/compositor/compositor_api/qwaylandquickitem.cpp b/src/compositor/compositor_api/qwaylandquickitem.cpp
index 708baf36..bf165b15 100644
--- a/src/compositor/compositor_api/qwaylandquickitem.cpp
+++ b/src/compositor/compositor_api/qwaylandquickitem.cpp
@@ -846,6 +846,10 @@ void QWaylandQuickItem::handleSubsurfaceAdded(QWaylandSurface *childSurface)
     } else {
         bool success = QMetaObject::invokeMethod(d->subsurfaceHandler, "handleSubsurfaceAdded", Q_ARG(QWaylandSurface *, childSurface));
         if (!success)
+            success = QMetaObject::invokeMethod(d->subsurfaceHandler, "handleSubsurfaceAdded",
+                                                Q_ARG(QVariant, QVariant::fromValue(childSurface)));
+
+        if (!success)
             qWarning("QWaylandQuickItem: subsurfaceHandler does not implement handleSubsurfaceAdded()");
     }
 }