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Save and restore the text selection

Here are the functions for saving and restoring the text selection:

// Save the selection
// Return a `Range` instance if there is a selected text
const save = function() {
    const selection = window.getSelection();
    return selection.rangeCount === 0 ? null : selection.getRangeAt(0);
};

// Restore the selection
// `range` is a `Range` object
const restore = function(range) {
    const selection = window.getSelection();
    selection.removeAllRanges();
    selection.addRange(range);
};

Might be useful