Focus tracker does not focus on tab item

[brichet]

Focus tracker does not focus on tab item

[brichet]

Some more context after a little introspection:

Adding the tabindex attribute to tabs allows them to get focus (that's the point).
In Jupyterlab, the focusTracker tracks every element added to the shell, including the TabBar.
Since tabs never get focus, the TabBar could not be the current widget of the focusTracker.

Right-clicking on a selected tab should bring up the context menu for the widget displayed (the open document in the case of mainArea). This uses the focusTracker.current widget to choose whether or not to display certain options.
Now that the TabBar can receive focus, it becomes the current widget when a tab is right-clicked, which change the behavior of the context menu.

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