Fix leaked subsurface wayland items

Whenever a subsurface was added we would create a QWaylandQuickItem,
but this was never deleted. It is one-to-one with the surface, so it
should be deleted at the same time.

[ChangeLog][QtWaylandCompositor] Fixed a memory leak when creating
subsurfaces.

Pick-to: 5.15 5.12
Task-number: QTBUG-88782
Change-Id: If4b3f15200ce3bd123ff73847d3593d174a39229
Reviewed-by: Paul Olav Tvete <paul.tvete@qt.io>

1 files changed, 1 insertions, 0 deletions

diff --git a/src/compositor/compositor_api/qwaylandquickitem.cpp b/src/compositor/compositor_api/qwaylandquickitem.cpp
index 36d0b3715..cf0994ba7 100644
--- a/src/compositor/compositor_api/qwaylandquickitem.cpp
+++ b/src/compositor/compositor_api/qwaylandquickitem.cpp
@@ -755,6 +755,7 @@ void QWaylandQuickItem::handleSubsurfaceAdded(QWaylandSurface *childSurface)
         childItem->setVisible(true);
         childItem->setParentItem(this);
         connect(childSurface, &QWaylandSurface::subsurfacePositionChanged, childItem, &QWaylandQuickItem::handleSubsurfacePosition);
+        connect(childSurface, &QWaylandSurface::destroyed, childItem, &QObject::deleteLater);
     } else {
         bool success = QMetaObject::invokeMethod(d->subsurfaceHandler, "handleSubsurfaceAdded", Q_ARG(QWaylandSurface *, childSurface));
         if (!success)