Video finishing before moving to next photo/video in slideshow mode

[sancsin]

Enhancement

Current behaviour

When I'm running the slideshow and it plays a video, the slideshow does not wait for the video to finish. Which in my opinion isn't the best user experience.

Desired behaviour

When I'm running the slideshow, the slideshow timer should apply for photos. But for videos, the video should be allowed to finish before moving on. to the next photo/video. Unless, the user manually forces the slideshow to move to next photo/video

[ildyria]

Fixed by #2927