libdasc/editor: Use a bytes.Buffer in commitBuffer to ease error handling
libdasc/editor: Use a bytes.Buffer in commitBuffer to ease error handling

ke7ofi/elvish,elves/elvish,elves/elvish,elves/elvish,CodyGuo/elvish,ke7ofi/elvish,elves/elvish,elves/elvish,CodyGuo/elvish,beni55/elvish,beni55/elvish