function initApp(el) {
	container = el;
	container.classList.add("files");
	container.setAttribute("data-msg", strings["open folder"]);
	container.style.overflowX = "auto";
	container.addEventListener("click", clickHandler);
	editorManager.on(
		["new-file", "int-open-file-list", "remove-file"],
		(position) => {
			if (
				typeof position === "string" &&
				position !== settings.OPEN_FILE_LIST_POS_SIDEBAR
			)
				return;
			const fileList = container.get(":scope > div.file-list");
			if (fileList) fixHeight(fileList);
		},
	);
	editorManager.on("add-folder", fixHeight);
	Sidebar.on("show", onSelected);
}
Initialize files app
@param {HTMLElement} el