Is a selection of t a point or a duration?

[azaroth42]

According to the PointSelector definition, the value of t is a floating point number of seconds. It thus selects an instant in time with a 0 duration.

The Presentation API says:

A segment of the Canvas’s area using the media fragment syntax of #xywh= for spatial regions, and/or #t= for temporal segments.

The definition of t in media fragments:

denoted by the name t, and specified as an interval with a begin time and an end time

This led to confusion in #2253 as to how to select a point over time, and we should fix it.

[azaroth42]

Eds to discuss and come back with a proposal

[azaroth42]

Will be solved by #2280 if approved