re-add deprecated to Condition::new remove breaking changes.

CHANGES.md

@@ -8,7 +8,7 @@
 ### Changed
 * Associated type `FromRequest::Config` was removed. [#2233]
 * Inner field made private on `web::Payload`. [#2384]
-* `middleware::Condition::new` was removed in favour of `middleware::conditionally` 
+* `middleware::Condition::new` was deprecated in favour of `middleware::conditionally` 
 
 [#2233]: https://github.com/actix/actix-web/pull/2233
 [#2362]: https://github.com/actix/actix-web/pull/2362

src/middleware/condition.rs

@@ -18,7 +18,7 @@ use std::sync::Mutex;
 ///
 /// # Examples
 /// ```
-/// use actix_web::middleware::{Condition, NormalizePath, TrailingSlash, conditionally, optionally, optionally_fut};
+/// use actix_web::middleware::{Condition, NormalizePath, TrailingSlash, conditionally, optionally, optionally_fut, futurally};
 /// use actix_web::App;
 /// use std::future::ready;
 ///
@@ -38,6 +38,13 @@ pub struct Condition<T, F>(Rc<Mutex<F>>)
 where
     F: Future<Output = Option<T>> + Unpin + 'static;
 
+impl<T> Condition<T, Ready<Option<T>>> {
+    #[deprecated(since = "4.0.0", note = "Use middleware::conditionally instead")]
+    pub fn new(enable: bool, transformer: T) -> Self {
+        conditionally(enable, transformer)
+    }
+}
+
 pub fn futurally<T, F>(transformer: F) -> Condition<T, F>
 where
     F: Future<Output = Option<T>> + Unpin + 'static,