Test view containers

[sandy081]

Refs: #43645

• mac: @chrisdias
• win @sbatten
• linux @tsalinger

Complexity: 3

Write an extension that contributes view containers and views

• Enable your extension to use proposed api by adding following flag to package.json

"enableProposedApi": true

• Register a view container in activity bar using viewsContainers extension point. For example:

"contributes": {
	"viewsContainers": {
		"activitybar": [
                        {
			    "id": "test",
			    "title": "Test",
			     "icon": "resources/test.svg"
		        }
                  ]
	}
}

• Add views to the above registered view container. For example:

"contributes": {
	"views": {
		"test": [
			{
				"id": "myview",
				"name": "My View"
			}
		]
	}
}

• You can implement the view by referring to documentation and [samples] (https://github.com/Microsoft/vscode-extension-samples/tree/master/tree-view-sample).

Verify:

• Registered view container is shown in the activity bar
• Views added to the above view container are shown
• Make sure you can hide/show/move (position) the views
• Make sure you can pin/unpin/hide/show/move (position) the new view container
• Make sure the activity bar items retain state (pinned, visibility, position) on refresh.
• Make sure there is a command to toggle view container. Eg: View: Open Test View
• Make sure Views: Open View command shows newly added views are grouped under the correct container.
• Make sure the View container and Views are not shown when the extension is disabled