Diagnostic suggestions highlighting can become misaligned

[Alexendoo]

Given a cargo +nightly clippy on the following:

#[derive(Copy, Clone)]
struct Foo(bool);

impl Into<(Foo, Foo)> for Foo {
    fn into(self) -> (Foo, Foo) {
        (self, self)
    }
}

fn main() {}

The current output is:

In line 6, (val, val) the second highlight is misaligned, it's highlighted at (val, v~al)~

[NotStirred]

@rustbot claim

[NotStirred]

@rustbot release-assignment

Releasing as I am unable to test my changes to the compiler with clippy, perhaps due to #81431
If anyone can provide any guidance I'd be grateful

I believe the issue is in rustc_errors::CodeSuggestion::splice_lines, but can't verify without testing

[NotStirred]

This appears to be fixed on latest master

Though I am unsure of which commit fixed it

[Alexendoo]

Nice, looks like it was fixed by #108627