XXX: add tab not quite right

[Matt Layman]

entertainerlib/frontend/gui/screens/artist_screen.py lines 57-59:

        # XXX: laymansterms - figure this out, why do we need to add directly
        # to the screen instead of the tab group, why is the positioning
        # messed up when these are commented out. This should be done in add_tab

For some reason a tab object must be added to a tab group and the screen. When trying to add the tab to the tab group through the add_tab method, something about the screen's positioning gets messed up. This needs to be fixed so that the tab/tab_group API doesn't have to add a tab in two different places.

[Samuel Buffet (samuel-buffet)]

Agreed, I've refactored the scalable Tab group that way :)

[Samuel Buffet (samuel-buffet)]

This has been already fixed by Matt (I think)

[Samuel Buffet (samuel-buffet)]

No, this is not fixed, but this part of the code has moved to the Screen Class