Menubar View -> Preview does not work

[chchwy]

as title.

[chchwy]

This feature is not implemented yet. This task will be a piece of cake if the canvas renderer is ready.

[Kaikogf]

This is related to an Issue I open recently (#735)

[Jose-Moreno]

This is a feature that we have discussed verily for a long time yet we've never been able to pinpoint how it's going to happen. Perhaps this needs to be discussed again, to see if it's even feasible to do it with the current code.

My first naive approach to this would be to expect that a preview feature would create a proxy render (low res version of the movie) "on the fly" and allow playback on a "player" window.

A more involved solution would allow Pencil2D to playback this proxy version by using the timeline itself, perhaps by create a temporary layer, emptying the image cache and just showing the proxy layer, however I feel this would still be dependent on how caching and hardware resources affect playback, whereas having a movie player might be more efficient for performance (and reviewing the animation timing)