Merge #7703

7703: Allow comments between newlines in chaining hints r=Veykril a=unratito

Currently, chaining hints are not generated if there are comments between newlines, which is a very common pattern:

```rust
let vec = (0..10)
    // Multiply by 2
    .map(|x| x * 2)
    // Add 3
    .map(|x| x + 3)
    .collect::<Vec<i32>>();
```

Besides, it seems a bit weird that this piece of code generates a chaining hint:

```rust
let vec = (0..10)



    .collect::<Vec<i32>>();
```

But this one doesn't:

```rust
let vec = (0..10)

    // This is a comment

    .collect::<Vec<i32>>();
```


Co-authored-by: Paco Soberón <[email protected]>

Author: bors[bot]

crates/ide/src/inlay_hints.rs

@@ -109,26 +109,31 @@ fn get_chaining_hints(
     // Chaining can be defined as an expression whose next sibling tokens are newline and dot
     // Ignoring extra whitespace and comments
     let next = tokens.next()?.kind();
-    let next_next = tokens.next()?.kind();
-    if next == SyntaxKind::WHITESPACE && next_next == T![.] {
-        let ty = sema.type_of_expr(&expr)?;
-        if ty.is_unknown() {
-            return None;
+    if next == SyntaxKind::WHITESPACE {
+        let mut next_next = tokens.next()?.kind();
+        while next_next == SyntaxKind::WHITESPACE {
+            next_next = tokens.next()?.kind();
         }
-        if matches!(expr, ast::Expr::PathExpr(_)) {
-            if let Some(hir::Adt::Struct(st)) = ty.as_adt() {
-                if st.fields(sema.db).is_empty() {
-                    return None;
+        if next_next == T![.] {
+            let ty = sema.type_of_expr(&expr)?;
+            if ty.is_unknown() {
+                return None;
+            }
+            if matches!(expr, ast::Expr::PathExpr(_)) {
+                if let Some(hir::Adt::Struct(st)) = ty.as_adt() {
+                    if st.fields(sema.db).is_empty() {
+                        return None;
+                    }
                 }
             }
+            acc.push(InlayHint {
+                range: expr.syntax().text_range(),
+                kind: InlayKind::ChainingHint,
+                label: hint_iterator(sema, &famous_defs, config, &ty).unwrap_or_else(|| {
+                    ty.display_truncated(sema.db, config.max_length).to_string().into()
+                }),
+            });
         }
-        acc.push(InlayHint {
-            range: expr.syntax().text_range(),
-            kind: InlayKind::ChainingHint,
-            label: hint_iterator(sema, &famous_defs, config, &ty).unwrap_or_else(|| {
-                ty.display_truncated(sema.db, config.max_length).to_string().into()
-            }),
-        });
     }
     Some(())
 }
@@ -983,6 +988,7 @@ struct C;
 fn main() {
     let c = A(B(C))
         .into_b() // This is a comment
+        // This is another comment
         .into_c();
 }
 "#,