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Improve frontend guideline (#23252)

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If an event listener must be `async`, the `e.preventDefault()` should be
before any `await`,
it's recommended to put it at the beginning of the function.
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docs/content/doc/developers/guidelines-frontend.en-us.md
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@ -83,6 +83,9 @@ It's not recommended to use `async` event listeners, which may lead to problems.
The reason is that the code after await is executed outside the event dispatch.
Reference: https://github.com/github/eslint-plugin-github/blob/main/docs/rules/async-preventdefault.md
If an event listener must be `async`, the `e.preventDefault()` should be before any `await`,
it's recommended to put it at the beginning of the function.
If we want to call an `async` function in a non-async context,
it's recommended to use `const _promise = asyncFoo()` to tell readers
that this is done by purpose, we want to call the async function and ignore the Promise.