Convert (emphasis) to (emphasis:1.1)

        closeCharacter = '>';

        delta = opts.keyedit_precision_extra;

    } else if (selectionStart > 0 && /\(.*\)|\[.*\]/s.test(text.slice(selectionStart - 1, selectionEnd + 1))) {

        closeCharacter = null;

        if (isPlus) {

            text = text.slice(0, selectionStart) + text[selectionStart - 1] + text.slice(selectionStart, selectionEnd) + text[selectionEnd] + text.slice(selectionEnd);

            selectionStart++;

            selectionEnd++;

        let start = text[selectionStart - 1];

        let end = text[selectionEnd];

        let numParen = 0;

        while (text[selectionStart - numParen - 1] == start && text[selectionEnd + numParen] == end) {

            numParen++;

        }

        if (start == "(") {

            weight = 1.1 ** numParen;

        } else {

            text = text.slice(0, selectionStart - 1) + text.slice(selectionStart, selectionEnd) + text.slice(selectionEnd + 1);

            selectionStart--;

            selectionEnd--;

            weight = 0.9 ** numParen;

        }

        text = text.slice(0, selectionStart - numParen) + "(" + text.slice(selectionStart, selectionEnd) + ":" + weight + ")" + text.slice(selectionEnd + numParen);

        selectionStart -= numParen - 1;

        selectionEnd -= numParen - 1;

    } else if (selectionStart == 0 || !/\(.*:-?[\d.]+\)/s.test(text.slice(selectionStart - 1, selectionEnd + text.slice(selectionEnd).indexOf(")") + 1))) {

        // do not include spaces at the end

        while (selectionEnd > selectionStart && text[selectionEnd - 1] == ' ') {

        selectionEnd++;

    }

    if (closeCharacter) {

    var end = text.slice(selectionEnd + 1).indexOf(closeCharacter) + 1;

    var weight = parseFloat(text.slice(selectionEnd + 1, selectionEnd + end));

    if (isNaN(weight)) return;

    weight += isPlus ? delta : -delta;

    weight = parseFloat(weight.toPrecision(12));

        if (String(weight).length == 1) weight += ".0";

    if (Number.isInteger(weight)) weight += ".0";

    if (closeCharacter == ')' && weight == 1) {

        var endParenPos = text.substring(selectionEnd).indexOf(')');

    } else {

        text = text.slice(0, selectionEnd + 1) + weight + text.slice(selectionEnd + end);

    }

    }

    target.focus();

    target.value = text;