No preview of .adoc files when open remote repository in VS Code Web

[OldKrab]

When i open remote repository from github on vscode.dev, the preview of .adoc files is not displayed:

Screenshot

If refresh page at this state, we can see error message in Preview window:

Screenshot

When i create new empty file without saving it as a real file, preview works fine, until i save it:

Screenshot

Steps to reproduce:

1. Open vscode.dev
2. Click "Open Remote Repository" in Explorer panel
3. Click "Open Repository from Github" and select any repo
4. Open any .adoc file and click Preview button

[ggrossetie]

I can reproduce this issue. The underlyon error seems to be:

D.P.onmessage @ webWorkerExtensionHost.ts:213
extHostFileSystemConsumer.ts:241 Uncaught (in promise) Unavailable (FileSystemError): Error: No file system handle registered (/asciidoctor)
	at p.e (../../../vs/workbench/api/worker/extensionHostWorker.js:82:27804)
	at Object.stat (../../../vs/workbench/api/worker/extensionHostWorker.js:82:24551)
e @ extHostFileSystemConsumer.ts:241
stat @ extHostFileSystemConsumer.ts:60
Promise.then (async)
step @ preview.ts:3
fulfilled @ preview.ts:3
Promise.then (async)
step @ preview.ts:3
eval @ preview.ts:3
__awaiter @ preview.ts:3
doUpdate @ preview.ts:355
update @ preview.ts:253
preview @ previewManager.ts:62
eval @ showPreview.ts:41
eval @ showPreview.ts:3
__awaiter @ showPreview.ts:3
showPreview @ showPreview.ts:22
execute @ showPreview.ts:56
h @ extHostCommands.ts:248
$executeContributedCommand @ extHostCommands.ts:313
S @ rpcProtocol.ts:456
Q @ rpcProtocol.ts:441
M @ rpcProtocol.ts:371
L @ rpcProtocol.ts:297
eval @ rpcProtocol.ts:161
z @ event.ts:1138
fire @ event.ts:1169
s.port1.onmessage @ extensionHostWorker.ts:195
commons-app~pfHelper-HttpManager.js.5254ed0a698fdcccc447.js:1 

[ggrossetie]

I found the root cause, the AsciidoctorConfig feature is not compatible with VS Code Web. More precisely, this line:

asciidoctor-vscode/src/features/asciidoctorConfig.ts

Line 51 in d036093

await vscode.workspace.fs.stat(uri)

[ggrossetie]

We should probably mimick what the Markdown extension is doing with a dedicated entry point for the web/browser extension:

https://github.com/microsoft/vscode/blob/main/extensions/markdown-language-features/src/extension.browser.ts

That way we can decide which feature we want to enable on the web/browser extension.