select command incompatible between IDE and selenium-side-runner

[lijingmu]

🐛 Bug Report

If select command has a value of index, the result is incompatible with selenium-side-runner. In Selenium IDE, the index of 6 is the seventh child. However in selenium-side-runner, it is the sixth child.

{
      "id": "c26f2fcb-37ee-463a-a891-16ec2c80d8d1",
      "comment": "",
      "command": "select",
      "target": "id=month",
      "targets": [],
      "value": "index=6"
    }

https://github.com/SeleniumHQ/selenium-ide/blob/trunk/packages/side-runtime/src/webdriver.ts#L2096

index: (index: string) => By.css(`*:nth-child(${index})`),

To Reproduce

Steps to reproduce the behavior:
I provided a script below

Expected behavior

A clear and concise description of what you expected to happen.
Selenium IDE and selenium-side-runner are compatible.

Project file reproducing this issue (highly encouraged)

Please provide a project file .side that reproduces this issue.

{
  "id": "cd6cb310-1c43-41a8-98a8-d77f5673ff79",
  "version": "2.0",
  "name": "customer-mockup",
  "url": "https://www.timeanddate.com",
  "tests": [{
    "id": "765c8d65-8988-4e06-874d-ef0c255bd682",
    "name": "click-assert",
    "commands": [{
      "id": "d83c2f01-53e0-40eb-8e75-a4419f19f0d1",
      "comment": "",
      "command": "open",
      "target": "/",
      "targets": [],
      "value": ""
    }, {
      "id": "8795b840-4de3-45e2-a091-72257f1d5bba",
      "comment": "",
      "command": "click",
      "target": "xpath=//label[contains(., 'Month')]",
      "targets": [],
      "value": ""
    }, {
      "id": "c26f2fcb-37ee-463a-a891-16ec2c80d8d1",
      "comment": "",
      "command": "select",
      "target": "id=month",
      "targets": [],
      "value": "index=6"
    }, {
      "id": "c531ef1d-d623-492d-8c1a-3ea0e8df8aa4",
      "comment": "",
      "command": "click",
      "target": "xpath=//input[@value='View Calendar']",
      "targets": [],
      "value": ""
    }, {
      "id": "e14a5acc-c16a-4119-9976-fcf13296d60e",
      "comment": "",
      "command": "waitForElementPresent",
      "target": "xpath=//h1[contains(., 'Calendar for June 2024 (United States)')]",
      "targets": [],
      "value": "10000"
    }]
  }],
  "suites": [{
    "id": "9e968b64-54fe-43a1-8356-546ba21b2b92",
    "name": "Default Suite",
    "persistSession": false,
    "parallel": false,
    "timeout": 300,
    "tests": ["765c8d65-8988-4e06-874d-ef0c255bd682"]
  }],
  "urls": ["https://www.timeanddate.com/"],
  "plugins": []
}

Issues without a reproduction project are likely to stall.

Environment

OS: Linux
Selenium IDE Version: 3.17.4
Selenium SIDE Runner Version: 4.0.12
Node version: v18.19.1

Browser:
Browser Version: Firefox 128.0.3