jQuery Autocomplete - Error when user enters text in a textarea in new line

Question

The Autocomplete doesn't seem to work with multiple values if the user presses the return key in a textarea and enters text in a new line.

In such case, though the values are shown, pressing TAB or return key doesn't enter them in the textarea.

The options set are as follows:

$("#search").autocomplete(colls, {
    multiple: true,
    autoFill: false,
    matchContains: true,
    max: 100,
    multipleSeparator: " "
});