QListWidget internal move doesn't work.

Hi,

I prepared a small test project to help confirm the bug.

I use QListWidget to show some data. And i want to be able to move rows. For this QListWidget provide special drag and drop mode "internal move". All works fine until i open a dialog first time and move any number of rows. After that any reopening a dialog and trying to move rows again hang the app. Nothing works and i cannot use a mouse at all, losing a focus by application also doesn't help. Only pressing Esc quit drag mode.

To summarize:

1. Click on button Open dialog.
2. Move a row. 
3. Close the dialog.
4. Open it again.
5. Try move a row.
6. Press Esc to quit drag mode.

Maybe i do something wrong, but i cannot get it how internal move can work only for first call only.