Focus in the Property Editor and a workflow validation

A value change in the Property Editor is not taken into account if focus is still on the selected field. Thus, it is possible to run a workflow without correct validation.

Scenario:

1. Open the attached uwl file in the WD. Make sure all required parameters are set.
2. Click the "Validate workflow" button on the toolbar.
   Expected result: the workflow is valid.
3. Select "Filter by Classification" element.
4. In the Property Editor change value of the "Input URL 2" slot to empty. Don't change focus.
5. Click the "Validate workflow" button.
   Expected result: there is an error in the "Error list":

   Workflow cannot be executed: "Filter by Classification": The mandatory "Input URL2" slot is not connected.
   

   Current result: message box "Workflow is valid!" is shown.

6. Click the "Validate workflow" button.
   Current result: the expected error is shown.