Rollup merge of #97798 - WaffleLapkin:allow_for_suggestions_that_are_quite_far_away_from_each_other, r=estebank

Hide irrelevant lines in suggestions to allow for suggestions that are far from each other to be shown

This is an attempt to fix suggestions one part of which is 6 lines or more far from the first. I've noticed "the problem" (of not showing some parts of the suggestion) here: https://github.com/rust-lang/rust/pull/97759#discussion_r889689230.

I'm not sure about the implementation (this big closure is just bad and makes already complicated code even more so), but I want to at least discuss the result.

Here is an example of how this changes the output:

Before:
```text
help: consider enclosing expression in a block
  |
3 ~     'l: { match () { () => break 'l,
4 |
5 |
6 |
7 |
8 |
...
```

After:
```text
help: consider enclosing expression in a block
  |
3 ~     'l: { match () { () => break 'l,
4 |
...
31|
32~ } };
  |
```

r? `@estebank`
`@rustbot` label +A-diagnostics +A-suggestion-diagnostics

compiler/rustc_errors/src/lib.rs

@@ -1174,7 +1174,7 @@ impl HandlerInner {
             !this.emitted_diagnostics.insert(diagnostic_hash)
         };
 
-        // Only emit the diagnostic if we've been asked to deduplicate and
+        // Only emit the diagnostic if we've been asked to deduplicate or
         // haven't already emitted an equivalent diagnostic.
         if !(self.flags.deduplicate_diagnostics && already_emitted(self)) {
             debug!(?diagnostic);