Test: htmlLanguageParticipants contribution point

[aeschli]

Refs: #146730

• anyOS @tanhakabir
• anyOS @benibenj

Complexity: 3

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The html language support now supports a new contribution point that allows other languages to participate in the html language server features.

   "htmlLanguageParticipants": [
      {
        "languageId": "handlebars"
      }
    ]

In the samp,e above, the handlebars language registers to get all HTML features.

• Test that a handlebars file gets code completion, hovers...

• Set "html.trace.server": "messages" in the settings

• Disable the handlebar basic extension (Handlebars Language Basics), find it with @builtin handlebar

• Test that a handlebars file no longer get code completion, hovers.

• Verify that the HTML Language Server output view contains the log entry Extensions have changed, restarting HTML server...

• Open vscode repo and open the package.json from the handlebars extension

• Verify that you get hovers and code completions for the htmlLanguageParticipants contribution point

[tanhakabir]

"htmlLanguageParticipants": [
      {
        "languageId": "handlebars"
      }
    ]

This setting doesn't seem to be active for me. Is there somewhere else I should be using this instead of inside user settings?

[aeschli]

@tanhakabir It's a contribution point for 'package.json'. Example is here:

vscode/extensions/handlebars/package.json

Line 40 in e210bbf

"htmlLanguageParticipants": [

[angelozerr]

@aeschli I tested on Windows OS, and everything works perfectly.

As you report custom message like Extensions have changed, restarting HTML server..., I think it could be a good idea to report when HTML language server is started/restarted the list of htmlLanguageParticipants. It can be helpfull for custom extension to check that the custom language is registered as htmlLanguageParticipants.

And just for your information, we use this html language participant with our Qute support #146731 (comment) and it works perfectly.

[aeschli]

Thanks @angelozerr, good suggestion. I'll add it when I'm back from vacation...