Windows: Reload a saved new post, not an empty draft

src/window/index.ts

@@ -2998,10 +2998,13 @@ export class Window {
 				try {
 					iframe.contentWindow?.location.reload();
 				} catch {
-					// Cross-origin or detached frame — re-assign src
-					// as a fallback. The current src is what's already
-					// loaded, so re-setting it triggers a fresh load.
-					iframe.src = iframe.src;
+					// An isolated page (the block editor sends
+					// `Document-Isolation-Policy`) or a detached frame.
+					// Load the URL the page last reported, not `src`:
+					// the editor rewrites its own URL on a first save,
+					// and `src` would reload post-new.php, an empty new
+					// draft instead of the post that was just saved.
+					iframe.src = withChromelessParam( reloadedUrl ) ?? iframe.src;
 				}
 			};
 		} else {

tests/vitest/window-unsaved-navigation.test.ts

@@ -187,6 +187,29 @@ describe( 'a navigation the page inside can refuse', () => {
 		expect( win._deferredNavigationCommit ).toBeNull();
 	} );
 
+	test( 'reload of a frame it cannot reach loads the URL the page reported', async () => {
+		// The block editor is sent with `Document-Isolation-Policy`, so
+		// the shell cannot call its `location.reload()`, and a first save
+		// moves it from post-new.php to the saved post without touching
+		// `src`. Reloading `src` would open an empty new draft.
+		const iframe = win.iframe as HTMLIFrameElement;
+		iframe.src = ADMIN + 'post-new.php?openstation_chromeless=1';
+		win._reportedLocation = {
+			url: ADMIN + 'post.php?post=52&action=edit',
+			src: iframe.src,
+		};
+
+		win.reload();
+		await vi.waitFor( () => expect( asked ).toHaveLength( 1 ) );
+		answerGuard( false );
+
+		await vi.waitFor( () =>
+			expect( iframe.src ).toBe(
+				ADMIN + 'post.php?post=52&action=edit&openstation_chromeless=1',
+			),
+		);
+	} );
+
 	test( 'a second reload click cannot slip past the in-flight query', async () => {
 		win.reload();
 		await vi.waitFor( () => expect( asked ).toHaveLength( 1 ) );