winex11.drv: Don't call IDropTarget::{DragOver,DragLeave,Drop} functions if DragEnter fails.

dlls/winex11.drv/xdnd.c

@@ -285,7 +285,7 @@ void X11DRV_XDND_PositionEvent( HWND hWnd, XClientMessageEvent *event )
         /* Notify OLE of DragEnter. Result determines if we accept */
         HWND dropTargetWindow;
 
-        if (XDNDLastDropTargetWnd)
+        if (XDNDAccepted && XDNDLastDropTargetWnd)
         {
             dropTarget = get_droptarget_pointer(XDNDLastDropTargetWnd);
             if (dropTarget)
@@ -387,6 +387,8 @@ void X11DRV_XDND_DropEvent( HWND hWnd, XClientMessageEvent *event )
     TRACE("\n");
 
     /* Notify OLE of Drop */
+    if (XDNDAccepted)
+    {
         dropTarget = get_droptarget_pointer(XDNDLastDropTargetWnd);
         if (dropTarget)
         {
@@ -417,6 +419,7 @@ void X11DRV_XDND_DropEvent( HWND hWnd, XClientMessageEvent *event )
             }
             IDropTarget_Release(dropTarget);
         }
+    }
 
     if (drop_file)
     {
@@ -465,6 +468,8 @@ void X11DRV_XDND_LeaveEvent( HWND hWnd, XClientMessageEvent *event )
     TRACE("DND Operation canceled\n");
 
     /* Notify OLE of DragLeave */
+    if (XDNDAccepted)
+    {
         dropTarget = get_droptarget_pointer(XDNDLastDropTargetWnd);
         if (dropTarget)
         {
@@ -473,6 +478,7 @@ void X11DRV_XDND_LeaveEvent( HWND hWnd, XClientMessageEvent *event )
                 WARN("IDropTarget_DragLeave failed, error 0x%08X\n", hr);
             IDropTarget_Release(dropTarget);
         }
+    }
 
     X11DRV_XDND_FreeDragDropOp();
 }