Queries the PixbufAnimation that a pixbuf loader is currently creating.
In general it only makes sense to call this function after the [signalGdkPixbuf.PixbufLoader
area_prepared] signal has been emitted by the loader.
If the loader doesn't have enough bytes yet, and hasn't emitted the `area-prepared` signal, this function will return `NULL`.
| this |
A pixbuf loader |
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The animation that the loader is currently loading |