Which chapter a live dimension position corresponds to, or -1.
Used to mark the active tile from a dimensions-changed event. Matches on
the nearest step rather than equality: the viewer quantizes and clamps what
it is given, so the value that comes back is not always the one sent.
Which chapter a live dimension position corresponds to, or
-1.Used to mark the active tile from a
dimensions-changedevent. Matches on the nearest step rather than equality: the viewer quantizes and clamps what it is given, so the value that comes back is not always the one sent.