Make sure we fire view state updates when changing the webview position

#48246

src/vs/workbench/api/electron-browser/mainThreadWebview.ts

@@ -208,7 +208,8 @@ export class MainThreadWebviews implements MainThreadWebviewsShape, WebviewReviv
 		}
 
 		if (newActiveWebview && newActiveWebview.handle === this._activeWebview) {
-			// No change
+			// Webview itself unchanged but position may have changed
+			this._proxy.$onDidChangeWebviewPanelViewState(newActiveWebview.handle, true, newActiveWebview.input.position);
 			return;
 		}