Function updateScrollbars

external/.scrollLibs.js:5219–5234

(cm, measure)

  NullScrollbars.prototype.clear = function () {}

  function updateScrollbars(cm, measure) {
    if (!measure) {
      measure = measureForScrollbars(cm)
    }
    var startWidth = cm.display.barWidth,
      startHeight = cm.display.barHeight
    updateScrollbarsInner(cm, measure)
    for (var i = 0; (i < 4 && startWidth != cm.display.barWidth) || startHeight != cm.display.barHeight; i++) {
      if (startWidth != cm.display.barWidth && cm.options.lineWrapping) {
        updateHeightsInViewport(cm)
      }
      updateScrollbarsInner(cm, measureForScrollbars(cm))
      startWidth = cm.display.barWidth
      startHeight = cm.display.barHeight
    }
  }

  // Re-synchronize the fake scrollbars with the actual size of the
  // content.