Package-level declarations

On large windows, shows the list entry beside the detail entry above it, sliding the panes as room changes.

Whether the window is at least tablet-sized, as on tablets, Chromebooks and desktops.

Whether only the layout changed, as when a resized window becomes large or stops being large, not the screen.

Whether the window is large and wide enough to show a list and its detail side by side.

Cross-fades a layout change instead of sliding, since the same screen stays on top.