Problem summary
Using a shading node like PrmanShadingNode and editting a parameter name for the material interface will trigger a UI reload to display the new values. If the Parameters tab display has the scroll bar at the end of the tab when the new values are submitted, the UI reload resets the position back to the start and you need to scroll back down to review your updates.
Steps to reproduce
1. create a PrmanShadingNode and load KatanaAlphaPhong as the shader
2. expand all pages and go to Refraction
3. edit the RefractEta parameter using the 'Edit Parameter Name in Material Interface' setting name and group to anything. Hit OK and then you will see that the UI refreshes and the current view jumps back to the start of the parameter list, losing the scroll bar position.
Reproduced by support
Reproduced in 2.0v1 and 2.5v1b1. Can not reproduce in 1.6v3 where updating the value in the material interface doesn't refresh the UI to lose the scroll bar position and parameter tab current view. Marking as regression.
Expected behaviour
As per 1.6v3, updating parameters in the material interface should not change the Parameters tab view by jumping back to the top
Actual behaviour
Updating a parameter value in the material interface reloads the UI and jumps back to the start of the parameters view.