Function clickInGutter

static/js/codemirror/codemirror.js:1706–1729

(cm, e)

  }

  function clickInGutter(cm, e) {
    var display = cm.display;
    try { var mX = e.clientX, mY = e.clientY; }
    catch(e) { return false; }

    if (mX >= Math.floor(getRect(display.gutters).right)) return false;
    e_preventDefault(e);
    if (!hasHandler(cm, "gutterClick")) return true;

    var lineBox = getRect(display.lineDiv);
    if (mY > lineBox.bottom) return true;
    mY -= lineBox.top - display.viewOffset;

    for (var i = 0; i < cm.options.gutters.length; ++i) {
      var g = display.gutters.childNodes[i];
      if (g && getRect(g).right >= mX) {
        var line = lineAtHeight(cm.doc, mY);
        var gutter = cm.options.gutters[i];
        signalLater(cm, "gutterClick", cm, line, gutter, e);
        break;
      }
    }
    return true;
  }

  function onDragStart(cm, e) {
    if (eventInWidget(cm.display, e)) return;