Function visualLine

static/js/codemirror/codemirror.js:3719–3724

(doc, line)

  function collapsedSpanAtEnd(line) { return collapsedSpanAt(line, line.text.length + 1); }

  function visualLine(doc, line) {
    var merged;
    while (merged = collapsedSpanAtStart(line))
      line = getLine(doc, merged.find().from.line);
    return line;
  }

  function lineIsHidden(doc, line) {
    var sps = sawCollapsedSpans && line.markedSpans;