double_parens: consider one diagnostic instead of one per pair?

Description

#![allow(unused_parens)]
#![allow(non_upper_case_globals)]
#![allow(dead_code)]
#![cfg_attr(rustfmt, rustfmt::skip)]
static a: isize = ((((1))));

pub fn main() {}

clippy will print

warning: unnecessary parentheses
 --> a.rs:5:19
  |
5 | static a: isize = ((((1))));
  |                   ^^^^^^^^^ help: remove them: `(((1)))`
  |
  = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#double_parens
  = note: `#[warn(clippy::double_parens)]` on by default

warning: unnecessary parentheses
 --> a.rs:5:20
  |
5 | static a: isize = ((((1))));
  |                    ^^^^^^^ help: remove them: `((1))`
  |
  = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#double_parens

warning: unnecessary parentheses
 --> a.rs:5:21
  |
5 | static a: isize = ((((1))));
  |                     ^^^^^ help: remove them: `(1)`
  |
  = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#double_parens

warning: 3 warnings emitted

which seems a bit over the top, can clippy figure out that we can reduce ((((1)))) to (1) in one go?

warning: unnecessary parentheses
 --> a.rs:5:19
  |
5 | static a: isize = ((((1))));
  |                   ^^^^^^^^^ help: remove them: `(1)`
  |
  = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#double_parens
  = note: `#[warn(clippy::double_parens)]` on by default

Version

rustc 1.99.0-nightly (1a833e165 2026-07-29)
binary: rustc
commit-hash: 1a833e16546c2eb012758ddd499964fd8afee29e
commit-date: 2026-07-29
host: x86_64-unknown-linux-gnu
release: 1.99.0-nightly
LLVM version: 22.1.8

Additional Labels

No response

Reproduce the reported double_parens diagnostic with the Rust example in the issue, then trace the lint's implementation and existing tests. Update the behavior so nested redundant parentheses produce one diagnostic whose suggestion reduces ((((1)))) to (1), and verify the resulting output against the example.