Save and restore selection

<!-- buttons -->
<button onclick="saveSelection(event)">save</button>
<button onclick="restoreSelection(event)">restore</button>

<!-- element -->
<textarea id="entry">...</textarea>

<!-- call -->
<script>
let app = Redactor('#entry');

function saveSelection(e) {
    e.preventDefault();
    e.stopPropagation();

    app.editor.save();
}

function restoreSelection(e) {
    e.preventDefault();
    e.stopPropagation();

    app.editor.restore();
}
</script>