context:     lineIterator: function(sourceText)    {        var maxLineNoChars = (sourceText.lines.length + "").length;        var list = [];                for (var i = 0; i < sourceText.lines.length; ++i)        {            // Make sure all line numbers are the same width (with a fixed-width font)             var lineNo = (i+1) + "";            while (lineNo.length < maxLineNoChars)                lineNo = " " + lineNo;            list.push({lineNo: lineNo, text: sourceText.lines[i]});        }                return list;    },
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