Brackets undo issue

after.json

{
  "done": [
    {
      "ranges": [
        {
          "anchor": {
            "line": 34,
            "ch": 34
          },
          "head": {
            "line": 34,
            "ch": 34
          }
        }
      ],
      "primIndex": 0
    }
  ],
  "undone": [],
  "undoDepth": null,
  "lastSelTime": 1449471644054,
  "lastModTime": 0,
  "lastSelOp": 2574,
  "lastOp": null,
  "lastOrigin": null,
  "maxGeneration": 469,
  "generation": 469
}

before.json

  {
  "done": [
    {
      "ranges": [
        {
          "anchor": {
            "line": 33,
            "ch": 95
          },
          "head": {
            "line": 33,
            "ch": 95
          }
        }
      ],
      "primIndex": 0
    },
    {
      "ranges": [
        {
          "anchor": {
            "line": 49,
            "ch": 40,
            "xRel": 1
          },
          "head": {
            "line": 49,
            "ch": 40,
            "xRel": 1
          }
        }
      ],
      "primIndex": 0
    },
    {
      "ranges": [
        {
          "anchor": {
            "line": 48,
            "ch": 30,
            "xRel": 1
          },
          "head": {
            "line": 45,
            "ch": 10,
            "xRel": 1
          }
        }
      ],
      "primIndex": 0
    },
    {
      "ranges": [
        {
          "anchor": {
            "line": 34,
            "ch": 34,
            "xRel": 1
          },
          "head": {
            "line": 34,
            "ch": 34,
            "xRel": 1
          }
        }
      ],
      "primIndex": 0
    },
    {
      "changes": [
        {
          "from": {
            "line": 34,
            "ch": 34
          },
          "to": {
            "line": 34,
            "ch": 43
          },
          "text": [
            ""
          ]
        }
      ],
      "generation": 437
    },
    {
      "ranges": [
        {
          "anchor": {
            "line": 34,
            "ch": 43
          },
          "head": {
            "line": 34,
            "ch": 43
          }
        }
      ],
      "primIndex": 0
    }
  ],
  "undone": [],
  "undoDepth": null,
  "lastSelTime": 1449471056602,
  "lastModTime": 1449471056602,
  "lastSelOp": 2504,
  "lastOp": 2504,
  "lastSelOrigin": "+input",
  "lastOrigin": "+input",
  "maxGeneration": 454,
  "generation": 454
}

desc.md

Brackets issue #11826

CodeMirror history before and after saving (and losing undo history in process)