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