FIX incomplete or undefined document symbol

[ttax00]

When executing document symbol command with virtual document:

         
      <header class="fixed z-10 w-screen bg-gray-500 dark:bg-gray-800">
	<nav class="mx-auto px-2 sm:px-6 lg:px-8 grid grid-cols-2 md:grid-cols-3 gap-2">
		<div class="relative flex items-center justify-start h-16 col-span-1 md:col-span-2">
			<a href="#introduction" class="text-black dark:text-white">             </a>
			<div class="form-check form-switch ml-4">
				
			</div>
			<img src="./asset/moon-svgrepo-com.svg" alt="Night mode"
			class="h-8 w-8 filter dark:invert ml-4" />
		</div>
		<ul class="relative hidden sm:flex items-center justify-end h-16 text-black dark:text-white">
			<li class="mr-3">              </li>
			<li>
				<a href="https://www.rust-lang.org/">
					<img src="https://upload.wikimedia.org/wikipedia/commons/d/d5/Rust_programming_language_black_logo.svg"
					class="h-10 w-10 mr-3 filter dark:invert" alt="Rust" />
				</a>
			</li>
			<li>
				<a href="https://yew.rs/" >
					<img src="https://yew.rs/img/logo.png"
					class="h-10 w-10 mr-3" alt="Yew" />
				</a>
			</li>
			<li>
				<a href="https://tailwindcss.com/">
					<img src="https://upload.wikimedia.org/wikipedia/commons/d/d5/Tailwind_CSS_Logo.svg"
					class="h-10 w-10" alt="Tailwind CSS" />
				</a>
			</li>
		</ul>
	</nav>
</header>
	
	 

There was only 3 symbols detected and returned.

Expecting:

Which should be the same as making a new .html file with the content.

On first initialize, the symbols returned would be undefined instead of Symbol[].

Concerned snippet of code:

async provideDocumentSymbols(document, token, next) {
console.log("doing symbol!");
let result = undefined;
// FIXME: [1] result is undefined for a long time, perhaps HTML Language Service isn't started yet?
// FIXME: [2] HTML document symbol provided are greatly missing!
result = await commands.executeCommand<DocumentSymbol[]>(
	'vscode.executeDocumentSymbolProvider',
	vdocUri(document),
);

console.debug(result);
return result;
},