Links in the right sidebar unexpectedly take users to new pages

[InMatrix]

Feedback from a recent user study: users expect right sidebar on a webpage to serve as a table of contents for the current page and expect links to take them to different sections within that page instead of different pages. This is how docs.flutter.dev works. For example: https://docs.flutter.dev/ui/layout.

This mismatch of mental model and link behavior is exacerbated by the fact that many method/property-level pages have far less content than class-level pages.

Recommendation: change links in the right sidebar to anchor links for within-page navigation.