Slideshow controls can be killed by a single image

[oparoz]

Steps to reproduce

1. Create a folder and put a single image in it
2. Switch to Gallery view
3. Start the slideshow

Expected result

The picture should be shown and the play/pause controls should not appear

Actual result

Both the play and pause icons are shown and they overlap each other
Clicking on them will make them disappear and it won't be possible to use the slideshow any more until a full refresh is performed.

[oparoz]

@jancborchardt

[jancborchardt]

Next to the play/pause being hidden, the next/previous should also not be shown, right?

Can you check if it’s the only image in that folder and then deactivate the buttons? Add a class .hidden to them, and it should be handled via CSS.

[oparoz]

The code to hide stuff is already there, but it doesn't work.
https://github.com/owncloud/gallery/blob/master/js/slideshowcontrols.js#L59-L61