file_replace_contents

Wraps [method@Gio.

File.replace_contents_async].

This function copies contents into a [struct@GLib.Bytes] so the caller does not need to keep the buffer alive for the duration of the operation.

Parameters:

file	a [iface@Gio.File]
contents	the contents to write
etag	the etag or null
make_backup	if a backup file should be created
flags	a set of [flags@Gio.FileCreateFlags]
length	the length of contents

Returns:

a [class@Dex.Future] which resolves to the new etag, or null if no etag is available.