Starting all plugins when closing the workspace looks strange

[lmcbout]

Bug Description:

When you close a workspace, we can observe on the console that we start all plugins.
Should we just activate the plugins when we open a workspace? It looks weird to see the traces about all started plugins when you close a workspace.

Note: comes from the discussion #7885

Steps to Reproduce:

1. Start Theia with a workspace
2. Close the workspace, not Theia (File-> Close Workspace)
   --> Observe the traces on the console, all plugins get started

Additional Information

• Operating System: Ubuntu 18.04
• Theia Version: Latest

[akosyakov]

That's expected: close workspace reloads the window, plugins are reloaded for a new window, a empty workspace needs plugins as well, since you still can open a file or a plugin can contribute an action to create a new project.