Incorrect suggestion diff highlight for nonexistent variant

Code

enum A {
    B(),
}

fn foo(_: A) {}

fn main() {
    foo(A::C);
}

Current output

As shown in the screenshot attached, the diff marked with plus in the suggestion highlights the opening parenthesis in green.

Desired output

1. The plus diff should highlight the replacement B, not the parenthesis.
2. In the absence of a use A::B; statement, A::B should be suggested as the replacement instead of B.

Rationale and extra context

This bug affects latest stable 1.89.0 (29483883e 2025-08-04) and beta 1.90.0-beta.10 (67cb8e039 2025-09-11). In latest nightly 1.92.0-nightly (52618eb33 2025-09-14), this triggers a ICE as describe in issue #146261. This bug was discovered during the investigation of that ICE bug, might be the root cause of it.

Rust Version

rustc 1.89.0 (29483883e 2025-08-04)
binary: rustc
commit-hash: 29483883eed69d5fb4db01964cdf2af4d86e9cb2
commit-date: 2025-08-04
host: x86_64-unknown-linux-gnu
release: 1.89.0
LLVM version: 20.1.7

Start by reproducing the issue with the provided Rust snippet on the stable, beta, and nightly versions listed. Trace the compiler's suggestion diff handling for the nonexistent variant and compare it with the ICE investigation in issue #146261; done means the diff highlights B and suggests A::B when no use statement exists, without triggering the ICE.