If you press the [X] button, the expected behavior should be the abortion of the operation. However, in this case, it leads to the execution of the operation.
To reproduce:
- Load Pic3D.nrrd
- Go to Segmentation --> Threshold --> Confirm Segmentation
- Click [X] in the Dialog
- Segmentation is executed
This happens in all 3D segmentation plugins where you have to confirm the execution.