Improvement: Auto detect language mode if two extensions contribute to the same filename or file extension

[thernstig]

As an example, the Go extension contributes the following:

      {
        "id": "gotmpl",
        "extensions": [
          ".tmpl",
          ".gotmpl"
        ],
        "aliases": [
          "Go Template File"
        ]
      }

The .tmpl is used by many languages. According to microsoft/vscode-docs#2862 what VS Code does here, is to associate the .tmpl file with the extension that comes first in alphabetical order, in the case where two more more extensions associate different language ids (modes) with this extension.

My proposal is that VS code instead, if there is a clash, uses the Auto Detect feature of which language mode to use. And falls back to alphabetical if that does not work, and gives a notification about this. The notification should include:

• Which extension contributes to the extension name (or filename)
• The associated language id
• Which extension was chosen to identify the language mode. And why it was chosen (auto detect or not).

[vs-code-engineering]

This feature request is now a candidate for our backlog. The community has 60 days to upvote the issue. If it receives 20 upvotes we will move it to our backlog. If not, we will close it. To learn more about how we handle feature requests, please see our documentation.

Happy Coding!