GtkContainer::set_reallocate_redraws
set_reallocate_redraws() toggles whether redraws are necessary for the container, and if set to true will initiate the GtkWidget method queue_draw() as appropriate, allowing the content of the container to be re-set on the fly.
The default setting is false.
忘却曲線を使ってこの知識を確実に記憶に残す
