rustdoc: Source code sidebar should pin to selected file #73360
Description
For example this doc: https://doc.rust-lang.org/nightly/nightly-rustc/src/rustc_middle/macros.rs.html#2-7
When you click to the "<" button, it show the file structure and not scroll down to the current viewed file:
I expect to see rustdoc sidebar point to viewed file directly:
