Fixed scrolling-to-top on first change after creating an Ace Editor

To reproduce this bug:
 1. Start a new Ace Editor and sets its value to be some text longer than the screen.
 2. In your web browser, scroll down in the Ace Editor and then make an edit.
 3. The editor will scroll to line 0, likely hiding the edit you've just made.
 4. Subsequent edits behave correctly.