Source
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if (!$curr_control.data('is-activated')) {
$('.btn-undo', $container).show();
$curr_control.data('is-activated', true);
}
$curr_control.replaceWith($('<textarea>')
.addClass('textarea-flexible')
.attr({
id: $input.attr('id'),
name: $input.attr('name'),
placeholder: t('value'),
maxlength: $input.attr('maxlength')
})
.text($input.is(':disabled') ? '' : $input.val())
.on('focus blur', btnUndoFocusEventHandle)
);
$('.textarea-flexible', $container).textareaFlexible();
}
}