delete node sample bug fix suggestion

[sangjela]

suggestion for sample, https://codesandbox.io/s/vuejs-tree-sandbox-v3x-lmbyx

deleteNodeFunction: function (node) {
  const nodePath = this.$refs["my-tree"].findNodePath(node.id);
  const parentNodeId = nodePath.slice(-2, -1)[0];
  if (parentNodeId === undefined) {
    // 'root' node
    const nodeIndex =
      this.$refs["my-tree"].nodes.findIndex((x) => x.id !== node.id) - 1; **//this return -1 when list delete center. only work on end of nodes**
    this.$refs["my-tree"].nodes.splice(nodeIndex, 1);**//when nodeIndex -1, this delete last of nodes always, not select one**
  } else {
    // child node
    const parentNode = this.$refs["my-tree"].findNode(parentNodeId);
    const nodeIndex =
      parentNode.nodes.findIndex((x) => x.id !== node.id) - 1; **//this return -1 when list delete center. only work on end of nodes**
    parentNode.nodes.splice(nodeIndex, 1); **//when nodeIndex -1, this delete last of nodes always, , not select one**
  }
  console.log("example: remove node", node.id);
},

------------------- my fix suggestion -----------------------

deleteNodeFunction: function (node) {
  let nodePath = this.$refs["my-tree"].findNodePath(node.id);
  let parentNodeId = nodePath.slice(-2, -1)[0];
  if (parentNodeId === undefined) {
    // 'root' node
    console.log("root node delete");
    **let nodeIndex = this.$refs["my-tree"].nodes.findIndex((x) => x.id == node.id);**
    if (nodeIndex >= 0) {
      this.$refs["my-tree"].nodes.splice(nodeIndex, 1);
    } else {
      console.warn("root node delete - delete index < 0");
    }
  } else {
    // child node
    console.log("child node delete");
    let parentNode = this.$refs["my-tree"].findNode(parentNodeId);
    **let nodeIndex = parentNode.nodes.findIndex((x) => x.id == node.id);**
    if (nodeIndex >= 0) {
      parentNode.nodes.splice(nodeIndex, 1);
    } else {
      console.warn("child node delete - delete index < 0");
    }
  }
  console.log("example: remove node", node.id);
},