Make lint groups work correctly with warningsAsInfo and warningsAsHint

crates/ide_db/src/helpers.rs

@@ -282,3 +282,21 @@ pub fn for_each_break_expr(
         }
     }
 }
+
+/// Checks if the given lint is equal or is contained by the other lint which may or may not be a group.
+pub fn lint_eq_or_in_group(lint: &str, lint_is: &str) -> bool {
+    if lint == lint_is {
+        return true;
+    }
+
+    if let Some(group) = generated_lints::DEFAULT_LINT_GROUPS
+        .iter()
+        .chain(generated_lints::CLIPPY_LINT_GROUPS.iter())
+        .chain(generated_lints::RUSTDOC_LINT_GROUPS.iter())
+        .find(|&check| check.lint.label == lint_is)
+    {
+        group.children.contains(&lint)
+    } else {
+        false
+    }
+}