GTK draws the projector's menu bar in its window, not in a child window,
so the previous lookup found nothing and, under set -e and pipefail,
silently ended the block that moves the window. The movie is the
window's largest child, and its offset is the menu bar's height (56px
on flashbox). The block no longer stops on errors, logs what it measured
and where the window ended up, and GAME_WIDTH/GAME_HEIGHT, unused now,
are dropped.
branderson
d1cebec142