Allow single images to be excluded from the slideshow
Summary:
This allows to exlude single images from the slideshow by unchecking the little checkbox in the top right corner.
Feature or todo?: If a folder is removed I don't touch the unchecked Slides. So the list could get very big but if a formerly removed folder is
added again an excluded image will be excluded again.
Test Plan:
- Uncheck some images
- They don't appear in the slideshow
Reviewers: Plasma, VDG, ngraham, davidedmundson
Reviewed By: Plasma, VDG, ngraham, davidedmundson
Subscribers: davidedmundson, filipf, abetts, ngraham, plasma-devel
Tags: Plasma
Differential Revision: https://phabricator.kde.org/D19687