Autocomplete not working since commit 94ff8f0

[MihaelIsaev]

Describe the bug
Autocomplete has stopped working since commit 94ff8f0. SourceKit-LSP doesn't seem to start, and indexing doesn't occur.

To Reproduce
Steps to reproduce the issue:

1. Clone the vscode-swift repository
2. Open it in VSCode and reopen it in the provided DevContainer
3. Checkout the last working commit: git checkout 4d3313e (just before 94ff8f0)
4. Start debugging the extension (Cmd+R in my case, might be F5 for others)
5. Create a new Swift package project, e.g., swift-library, in the same directory and open it in the same window
6. Observe that the status bar shows Indexing 0/2, and autocomplete works as expected in Package.swift
7. Close the project window
8. Switch to the problematic commit: git checkout 94ff8f0
9. Launch the extension again via the debugger
10. The previously created project opens, but neither indexing starts nor does autocomplete work in Package.swift
11. Switch back to the previous commit using git checkout 4d3313e and confirm that everything works as expected again.
12. Check the following tags to confirm the issue persists across multiple versions:

• 2.4.0: git checkout 9a65f7a
• 2.6.0: git checkout 269d6f2
• 2.6.1: git checkout 942cf09
• latest commit: git checkout da07bbd
  Unfortunately, the issue appears to remain unresolved in all of these.

13. Switch back to the previous working commit using git checkout 4d3313e and confirm that everything functions as expected again.

Expected behavior
Autocomplete and indexing should continue to work without requiring additional setup when updating between minor versions.

Environment

• Docker DevContainer provided by the extension
• Swift versions tested: 6.0, 6.1, and 6.2-dev (from the DevContainer)
• Visual Studio Code version: 1.101.0
• vscode-swift version: not applicable (built from sources)

Additional context
Everything works fine on version 2.2.0. The issue starts with any newer 2.x version.

[MihaelIsaev]

On another machine, it works with the same setup. Other folks also tested version 2.6.1, and indexing with autocomplete works for them as well. In my case, it works on versions ≤2.2.0, but stops functioning on later versions.

So, what changed?

I discovered that I had the swift.disableSwiftPackageManagerIntegration flag enabled in the extension settings. This didn’t affect SourceKit-LSP in versions ≤2.2.0, but it does now. It seems this isn't a bug, but rather an intentional change. In fact, the fact that SourceKit-LSP was working with that flag enabled in ≤2.2.0 might have been the actual bug, is that correct?

[plemarquand]

Thanks for the report! It looks like in 94ff8f0 I didn't account for multi-root workspaces correctly and so these folders aren't added to sourcekit-lsp, which results in no indexing/auto complete for them. I have a fix up in #1668.