fix: reset background process when webview is closed, closes #536 (#556)

.changes/stop-background-process.md

@@ -0,0 +1,5 @@
+---
+"wry": patch
+---
+
+Fix to reset process on MacOS when webview is closed, closes #536.

src/webview/wkwebview/mod.rs

@@ -621,6 +621,11 @@ impl Drop for InnerWebView {
         }
       }
 
+      // WKWebview has a single WKProcessPool to manage web contents.
+      // The WKProcessPool is not reset even if WKWebview is deallocated.
+      // So we need to override the process by navigating to `about:blank`.
+      self.navigate("about:blank");
+
       let _: Id<_> = Id::from_ptr(self.webview);
       #[cfg(target_os = "macos")]
       let _: Id<_> = Id::from_ptr(self.ns_window);