Set view range scripting functions will not update timeline UI

Using the scripting functions to set the view range of a sequence will not update unless the sequence is re-opened. Usual updates for scripting issues like locking and unlocking the sequence don't work.

1. Create an editor utility widget
2. Add a button to the widget 
3. Add an On Clicked event for the button
4. On that event get the current level sequence, and call Set View Range End on it with an End Time in Seconds value of 20
5. Open a sequence
6. Run the utility widget and click the button

RESULT

The timeline does not change. Closing and reopening the sequence will show the correct results. Note: using Set Work Range End will update the timeline correctly