[vscode] Java Test Runner extension doesn't activate and icons are not loaded

[veredcon]

Bug Description:

VScode extension https://github.com/microsoft/vscode-java-test (0.22.3) is not activated in theia and icons are not loaded. It is stuck on activation.

Steps to Reproduce:

1. Go to https://theia-ide.org/
2. Click on "Try in Git Pod"
3. Drag & Drop the vsix to the extensions area

You can see the new panel of the Java:Test is added but the task bar shows the status of activating and it seems stuck there.
When I open the panel I cannot see the icons, tests are not recognized - seems like the activation really never finish.

Debugging it as hosted plugin shows:

Versions:
theia: 1.1.0
vscode-java-test: https://github.com/microsoft/vscode-java-test/releases/tag/0.22.3

In vscode-java-test 0.22.1 it was activated successfully and icons can be seen!

[akosyakov]

We could stub uiKind with desktop till we allow to run VS Code extensions in the web. But we should have the issue for later.

[tsmaeder]

@akosyakov doc says

The UI kind property indicates from which UI extensions are accessed from. For example, extensions could be accessed from a desktop application or a web browser.

Isn't this just electron->Desktop or browser->Web?

[tsmaeder]

I'll whip up a PR, shouldn't take more than a couple of hours.