The four tabs are now pages of one HorizontalPager on a single NavHost
route, so a sideways swipe moves between Alarms, Timers, Stopwatch and
World clock as well as tapping the bar. The pager is the source of truth
for the selected tab; editors, the timer setup page and Settings stay
NavHost destinations pushed over it. A tab tap from one of them pops
back to the tabs, and a deep link always lands on its tab rather than on
whatever nested screen was last open there.
Swiping is on only under a navigation bar: beside a rail the tabs are
stacked vertically, and a horizontal swipe has no counterpart there.
Closes#2
makiolaj
be526711d7