src/main/webapp/plugins/editor.md/lib/codemirror/addon/merge/merge.js

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// CodeMirror, copyright (c) by Marijn Haverbeke and others
// Distributed under an MIT license: http://codemirror.net/LICENSE

// declare global: diff_match_patch, DIFF_INSERT, DIFF_DELETE, DIFF_EQUAL

(function(mod) {
  if (typeof exports == "object" && typeof module == "object") // CommonJS
    mod(require("../../lib/codemirror"), require("diff_match_patch"));
  else if (typeof define == "function" && define.amd) // AMD
    define(["../../lib/codemirror", "diff_match_patch"], mod);
  else // Plain browser env
    mod(CodeMirror, diff_match_patch);
})(function(CodeMirror, diff_match_patch) {
  "use strict";
  var Pos = CodeMirror.Pos;
  var svgNS = "http://www.w3.org/2000/svg";

  function DiffView(mv, type) {
    this.mv = mv;
    this.type = type;
    this.classes = type == "left"
      ? {chunk: "CodeMirror-merge-l-chunk",
         start: "CodeMirror-merge-l-chunk-start",
         end: "CodeMirror-merge-l-chunk-end",
         insert: "CodeMirror-merge-l-inserted",
         del: "CodeMirror-merge-l-deleted",
         connect: "CodeMirror-merge-l-connect"}
      : {chunk: "CodeMirror-merge-r-chunk",
         start: "CodeMirror-merge-r-chunk-start",
         end: "CodeMirror-merge-r-chunk-end",
         insert: "CodeMirror-merge-r-inserted",
         del: "CodeMirror-merge-r-deleted",
         connect: "CodeMirror-merge-r-connect"};
  }

  DiffView.prototype = {
    constructor: DiffView,
    init: function(pane, orig, options) {
      this.edit = this.mv.edit;
      this.orig = CodeMirror(pane, copyObj({value: orig, readOnly: !this.mv.options.allowEditingOriginals}, copyObj(options)));

      this.diff = getDiff(asString(orig), asString(options.value));
      this.chunks = getChunks(this.diff);
      this.diffOutOfDate = this.dealigned = false;

      this.showDifferences = options.showDifferences !== false;
      this.forceUpdate = registerUpdate(this);
      setScrollLock(this, true, false);
      registerScroll(this);
    },
    setShowDifferences: function(val) {
      val = val !== false;
      if (val != this.showDifferences) {
        this.showDifferences = val;
        this.forceUpdate("full");
      }
    }
  };

  function ensureDiff(dv) {
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