We only show the back button when adding the floating view to the
drag layer if it is already "open". A couple of floating items
(folder and options popup) added first then set mIsOpen, causing
the back button to not appear. (We have to check that it is open,
and not just on the drag layer, because we want to get rid of the
back button when changing to some states such as spring-loaded. If
we only checked if the view was present, it wouldn't hide if one of
the floating views such as folder or shortcuts was animated closed.)
Bug: 76169527
Change-Id: I0dff6d2e3424eab72d47dccc42cc703a0fb0141b
> Removing support for page drag-n-drop from pagedView
> Removing Overview UI from Launcher3 without quickstep and using options popup instead
> Removing touch handlers from CellLayouts and showing options popup based on workspace long press
> Excluding touch outside inset when showing the popup
Bug: 74136505
Change-Id: I34c2a7ff58452db26f5d1a85d554be40fc75f2b8