remove legacy infobar

src/core/content/content-bootstrap.js

@@ -219,6 +219,10 @@ function savePage(docData, frames, { autoSaveUnload, autoSaveDiscard, autoSaveRe
 }
 
 async function openEditor(document) {
+	const infobarElement = document.querySelector("singlefile-infobar");
+	if (infobarElement) {
+		infobarElement.remove();
+	}
 	serializeShadowRoots(document);
 	const content = singlefile.helper.serialize(document);
 	for (let blockIndex = 0; blockIndex * MAX_CONTENT_SIZE < content.length; blockIndex++) {