Scroll bar jumps to the top of the window when changing Output Log 'Categories' checkboxes

When the Categories dropdown is changed in the Output Log, the scroll bar will jump to the top of the page. This does not match the behavior of using the search bar which will keep the scroll bar at the bottom as the log window updates.

Regression:
No - same behavior occurs in 4.16.3

1. Open UE4 Editor (Third person template)
2. Open Output Log so it is visible
3. Click object in the viewport to populate output log with

   LogEditorViewport: Clicking on Actor ********
   

4. Repeat until output log contains scroll bar
5. In the Output Log window, open the Categories dropdown and uncheck the box for "cmd"

Result:
Scroll bar jumps to the top when the categories list changes

Expected:
Unchecked categories are no longer displayed and scroll bar/view remains at the bottom of the output log