Send data_source.cancelled event when dropping on nothing

I.e. on the wallpaper. This will fix a bug where dragging things onto the
wallpaper in qwindow-compositor would make the drag icon stay there
indefinitely.

Change-Id: I19cb4e268346c3b4b624839939f295f64bf97aaf
Reviewed-by: Pier Luigi Fiorini <pierluigi.fiorini@gmail.com>
Reviewed-by: Erik Larsson <erik@ortogonal.com>
Reviewed-by: Giulio Camuffo <giulio.camuffo@kdab.com>

1 files changed, 2 insertions, 0 deletions

diff --git a/src/compositor/wayland_wrapper/qwldatadevice.cpp b/src/compositor/wayland_wrapper/qwldatadevice.cpp
index c7de964d7..b11bc8f4f 100644
--- a/src/compositor/wayland_wrapper/qwldatadevice.cpp
+++ b/src/compositor/wayland_wrapper/qwldatadevice.cpp
@@ -145,6 +145,8 @@ void DataDevice::drop()
     if (m_dragFocusResource) {
         send_drop(m_dragFocusResource->handle);
         setDragFocus(nullptr, QPoint());
+    } else {
+        m_dragDataSource->cancel();
     }
 }