SIGKILL on cargo-check crashes all open windows of VSCode

rust-analyzer version: rust-analyzer version: 0.3.1885-standalone (b6d1887bc 2024-03-17)

rustc version: rustc 1.77.0 (aedd173a2 2024-03-17)

relevant settings: Linux (Debian)

If cargo-check gets sigkilled, which can happen if there is a proc macro with an infinite loop, the entire backend process of VSCode gets killed (instead of only cargo-check). This is very annoying if you are writing proc macros and accidentally write an infinite loop, especially since RA runs cargo-check on startup. If the setting cargo-check on save is disabled, it still seems to find a way to run the proc macro.

code snippet to reproduce:

#[proc_macro]
fn my_macro(_: TokenStream) -> TokenStream {
    loop {}
}

// somewhere else
my_macro!()

Start by reproducing the issue with the proc-macro snippet and inspect how cargo-check is launched and terminated by the rust-analyzer backend. The fix is complete when a SIGKILL from cargo-check does not terminate the VSCode backend, including when cargo-check runs on startup.