Enable the unicorn/prefer-dom-node-append ESLint plugin rule

[Snuffleupagus]

This rule will help enforce slightly shorter code, especially since you can insert multiple elements at once, and according to MDN Element.append() is available in all browsers that we currently support.

Please find additional information here:

• https://developer.mozilla.org/en-US/docs/Web/API/Element/append
• https://github.com/sindresorhus/eslint-plugin-unicorn/blob/main/docs/rules/prefer-dom-node-append.md

[Snuffleupagus]

/botio test

[pdfjsbot]

From: Bot.io (Linux m4)

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Received

Command cmd_test from @Snuffleupagus received. Current queue size: 0

Live output at: http://54.241.84.105:8877/83f7ccaf30fed0d/output.txt

[pdfjsbot]

From: Bot.io (Windows)

---

Received

Command cmd_test from @Snuffleupagus received. Current queue size: 0

Live output at: http://54.193.163.58:8877/a32d95e6c36c218/output.txt

[pdfjsbot]

From: Bot.io (Linux m4)

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Failed

Full output at http://54.241.84.105:8877/83f7ccaf30fed0d/output.txt

Total script time: 20.96 mins

• Font tests: Passed
• Unit tests: FAILED
• Integration Tests: Passed
• Regression tests: FAILED

  errors: 716
  different ref/snapshot: 22
  different first/second rendering: 1

Image differences available at: http://54.241.84.105:8877/83f7ccaf30fed0d/reftest-analyzer.html#web=eq.log

[pdfjsbot]

From: Bot.io (Windows)

---

Success

Full output at http://54.193.163.58:8877/a32d95e6c36c218/output.txt

Total script time: 27.95 mins

• Font tests: Passed
• Unit tests: Passed
• Integration Tests: Passed
• Regression tests: Passed

[Snuffleupagus]

/botio-linux browsertest

[pdfjsbot]

From: Bot.io (Linux m4)

---

Received

Command cmd_browsertest from @Snuffleupagus received. Current queue size: 0

Live output at: http://54.241.84.105:8877/ceddec429bf8079/output.txt

[pdfjsbot]

From: Bot.io (Linux m4)

---

Failed

Full output at http://54.241.84.105:8877/ceddec429bf8079/output.txt

Total script time: 22.21 mins

• Regression tests: FAILED

  different ref/snapshot: 28

Image differences available at: http://54.241.84.105:8877/ceddec429bf8079/reftest-analyzer.html#web=eq.log

[Snuffleupagus]

This mostly mechanical change reduces the size of the gulp mozcentral output by just over 1 kB.

[calixteman]

Thank you.