Avoid using error background color in status bar unless absolutely necessary

rust-analyzer version: 0.4.1217-standalone (5b49745d0 2022-09-20)

rustc version: It's not installed

The VS Code codebase just had some Rust code committed for the first time and I saw this after restarting this morning:

This is on my Windows machine where I have no desire to install Rust. I understand this status bar item is important to diagnose what's wrong with rust-analyzer, but some repos contain rs files where the developer doesn't need to touch or compile them ever. I suggest you show this status bar conditionally, only when a .rs file is open.

The alternative is for me to uninstall the extension which I'd rather not do if it's well behaving wrt activation. I also don't want to right click to hide the item as in case I need it to diagnose (I think that gets synced too).

Start by locating the VS Code extension code that creates the rust-analyzer status bar item and trace when it is activated; the issue proposes showing it only while a .rs file is open. Done means repositories without an open Rust file no longer show the error-colored item, while opening a .rs file still exposes it for diagnostics.