Introduce a new signal when a drag is dropped

src/wayland/seat_interface.cpp

@@ -316,6 +316,7 @@ void SeatInterfacePrivate::endDrag(quint32 serial)
     if (dragSource) {
         // TODO: Also check the current drag-and-drop action.
         if (dragTargetDevice && dragSource->isAccepted()) {
+            Q_EMIT q->dragDropped();
             dragTargetDevice->drop();
             dragSource->dropPerformed();
         } else {

src/wayland/seat_interface.h

@@ -657,6 +657,11 @@ Q_SIGNALS:
      * @see dragSurface
      */
     void dragSurfaceChanged();
+
+    /** Emitted when a drop ocurrs in a drag'n'drop operation. This is emitted
+     * before dragEnded
+     */
+    void dragDropped();
     /**
      * Emitted whenever the focused text input changed.
      * @see focusedTextInput