Test of folding a specific just-created node

main.js

define(function (require, exports, module) {
  'use strict';

  var Extensions = require('ft/core/extensions').Extensions;

  function updateTree(tree, fn) {
    try {
      tree.beginUpdates();
      fn();
    } finally {
      tree.endUpdates();
    }
  }

  function prependChild(node, child) {
    if (node.firstChild) {
      node.insertChildBefore(child, node.firstChild);
    } else {
      node.appendChild(child);
    }
  }

  function test(editor, options, tagName) {
    var addTag;

    function fun(node) {
      var infos;
      if (node.firstChild && node.firstChild.line().trim() == ":INFOS:") {
        infos = node.firstChild;
      } else {
        infos = node.tree.createNode(":INFOS:");
        prependChild(node, infos);
      }
      var child = infos.tree.createNode("ADDED LINE");
      prependChild(infos, child);
      editor.collapseNode(infos);
    }

    if (options && options.node) {
      updateTree(node.tree, function () {
        fun(node);
      });
    } else {
      var range = editor.selectedRange();
      updateTree(editor.tree(), function () {
        range.forEachNodeInRange(fun);
      });
    }
  }

  Extensions.addCommand({
    name: 'test',
    description: 'Test',
    performCommand: function (editor, options) {
      test(editor, options);
    }
  });

  Extensions.addInit(function (editor) {
    editor.addKeyMap({
      'Cmd-Alt-D' : 'test'
    });
  });

});

test.ft

- blah
- item
- blah

Put your cursor on `item` then press Cmd-Alt-D

I used `editor.collapseNode(infos);` at line 36, which is not in the API :-/