dswid is not unique after opening link in new tab (in projects list)

1. Visit the Projects page. Note the dswid param value (?dswid=XYZ) in the address bar.
2. Middle-click on one of the projects (or use the context menu to select "open link in new tab")
3. Switch to the new tab. Note the dswid param in the address bar.

Expected result:
New tab has a different dswid. (The tab may initially load a page with the original dswid, but if so it should redirect to a new dswid.)

Actual result:
New tab has the same dswid. This will lead to all DeltaSpike's window-based scopes (including GroupedConversationScoped) accidentally sharing state between tabs.