actix-web-actors: take the internal buffer when yielding (#3369)

* actix-web-actors: take the internal buffer when yielding

* actix-web-actors: Add CHANGES entry re: taking buffer

actix-web-actors/CHANGES.md

@@ -2,6 +2,7 @@
 
 ## Unreleased
 
+- Take the encoded buffer when yielding bytes in the response stream rather than splitting the buffer, reducing memory use
 - Minimum supported Rust version (MSRV) is now 1.72.
 
 ## 4.3.0

actix-web-actors/src/ws.rs

@@ -710,7 +710,7 @@ where
         }
 
         if !this.buf.is_empty() {
-            Poll::Ready(Some(Ok(this.buf.split().freeze())))
+            Poll::Ready(Some(Ok(std::mem::take(&mut this.buf).freeze())))
         } else if this.fut.alive() && !this.closed {
             Poll::Pending
         } else {