`add_explicit_type` code action not available for `#[doc(hidden)]` types

rust-analyzer version: rust-analyzer version: 0.3.2078-standalone (fa0032624 2024-08-17)

rustc version: rustc 1.80.0 (051478957 2024-07-21)

editor or extension: Both Neovim and VSCode

code snippet to reproduce:

main.rs:

use ustr::UstrSet;

pub fn bar() -> UstrSet {
    todo!();
}

fn main() {
    let _i = 123;
    let foo = bar();
}

Cargo.toml:

[package]
name = "foo"
version = "0.1.0"
edition = "2021"

[dependencies]
ustr = "1.0.0"

When I try to perform the add_explicit_type code action on the variable i of a simple type the code action shows up just fine:

Whereas when I try to do the same thing on the variable foo that uses a type from an external crate (ustr in this case):

There's no code action available for inserting the type of foo.

Same behavior under VSCode.

Reproduce the issue using the main.rs and Cargo.toml snippets with ustr 1.0.0, comparing add_explicit_type for the local integer and the external UstrSet type. Trace the rust-analyzer implementation of this code action and verify that it becomes available for types marked #[doc(hidden)] while preserving the existing behavior for simple local types.