Be on a tablet device, so where you get the split screen in landscape but not in portrait mode.
While being in landscape mode (split screen) select an article (=> action bar contains article related buttons like share)
Rotate the screen to portrait, you are now on the article list (don't know if that is the right thing, you were looking on an article previously, I expect that I still see the article, but that might be a matter of taste)
Observe:
The action bar still contains sharing buttons, although you are in the article list. This even does not stop if you click on an article and then go back, still the article related buttons are there.
How to reproduce:
Observe: The action bar still contains sharing buttons, although you are in the article list. This even does not stop if you click on an article and then go back, still the article related buttons are there.