Scroll to the opened activity if it is not visible

[bubafinder]

I'm submitting a...

• [ ] Bug report
• [ ] Regression (a behavior that used to work and stopped working in a new release)
• [ ] Feature request
• [ ] Documentation issue or request
• [ ] Enhancement

Context

On the content editor page, within the browse sidebar, scroll to the opened activity if it is not visible because of the large content structure.