text: // CodeMirror, copyright (c) by Marijn Haverbeke and others
  // Distributed under an MIT license: https//codemirror.net/LICENSE
  
  (function(mod) {
    if (typeof exports == "object" && typeof module == "object") // CommonJS
      mod(require("../../lib/codemirror"));
    else if (typeof define == "function" && define.amd) // AMD
      define(["../../lib/codemirror"], mod);
    else // Plain browser env
      mod(CodeMirror);
  })(function(CodeMirror) {
    "use strict";
  
    CodeMirror.defineOption("scrollPastEnd", false, function(cm, val, old) {
      if (old && old != CodeMirror.Init) {
        cm.off("change", onChange);
        cm.off("refresh", updateBottomMargin);
        cm.display.lineSpace.parentNode.style.paddingBottom = "";
        cm.state.scrollPastEndPadding = null;
      }
      if (val) {
        cm.on("change", onChange);
        cm.on("refresh", updateBottomMargin);
        updateBottomMargin(cm);
      }
    });
  
    function onChange(cm, change) {
      if (CodeMirror.changeEnd(change).line == cm.lastLine())
        updateBottomMargin(cm);
    }
  
    function updateBottomMargin(cm) {
      var padding = "";
      if (cm.lineCount() > 1) {
        var totalH = cm.display.scroller.clientHeight - 30,
            lastLineH = cm.getLineHandle(cm.lastLine()).height;
        padding = (totalH - lastLineH) + "px";
      }
      if (cm.state.scrollPastEndPadding != padding) {
        cm.state.scrollPastEndPadding = padding;
        cm.display.lineSpace.parentNode.style.paddingBottom = padding;
        cm.setSize();
      }
    }
  });
  