Install Another Version is not working for Dart extension

[osaxma]

Describe the bug
When I click Install Another Version on Dart extension from VS code, the previous versions do not load (loading indicator does not stop):

I'm filing here because this is only happening with Dart extension, all the other extensions show previous versions instantly.

To Reproduce

1. Go to Extension tabs
2. Click on gear icon of Dart extension.
3. Click Install Another Version option.

Expected behavior
A drop down menu of previous versions should show up.

Versions (please complete the following information):

• VS Code version: 1.62.3
• Dart extension version: v3.28.0
• Dart/Flutter SDK version: Flutter 2.5.3 with Dart 2.14.4
• OS: Darwin x64 20.6.0

[DanTup]

Thanks for the report! I've seen this too, and unfortunately it's a VS Code issue and needs fixing there - it's apparently caused by ownership changes (so only affects some extensions):

microsoft/vsmarketplace#226

This PR might help things by checking versions in parallel:

microsoft/vscode#136992