fix(linter): only write fix results if source code has changed (#6096)

Closes #6061.

Read [this reply](#6061 (comment)) for context.

crates/oxc_linter/src/context/mod.rs

@@ -277,7 +277,7 @@ impl<'a> LintContext<'a> {
             (Some(message), None) => diagnostic.with_help(message.to_owned()),
             _ => diagnostic,
         };
-        if self.parent.fix.can_apply(rule_fix.kind()) {
+        if self.parent.fix.can_apply(rule_fix.kind()) && !rule_fix.is_empty() {
             let fix = rule_fix.into_fix(self.source_text());
             self.add_diagnostic(Message::new(diagnostic, Some(fix)));
         } else {

crates/oxc_linter/src/service.rs

@@ -268,7 +268,9 @@ impl Runtime {
             // TODO: Span is wrong, ban this feature for file process by `PartialLoader`.
             if !is_processed_by_partial_loader && self.linter.options().fix.is_some() {
                 let fix_result = Fixer::new(source_text, messages).fix();
-                fs::write(path, fix_result.fixed_code.as_bytes()).unwrap();
+                if fix_result.fixed {
+                    fs::write(path, fix_result.fixed_code.as_bytes()).unwrap();
+                }
                 messages = fix_result.messages;
             }