Georges Basile Stavracas Neto authored Jan 07, 2021 and Marge Bot committed Jan 19, 2021

Now that the Dash is horizontal, the popup menu of the Dash icons must
show up, instead of left/right.

Make AppIcon.popupMenu() receive an optional parameter with the side
to show the menu, using St.Side.LEFT as default. Override this method
in DashIcon to always pass St.Side.TOP.

Part-of: <!1559>