When you click on a thumbnail to open the screenshot pop-up, you can't navigate between screenshots with the arrow keys on the keyboard. The keys manipulate the view below the pop-up instead.
Git commit f2c21e33547f7ed2e1ca9c659d0b62ac98d29c98 by Aleix Pol. Committed on 18/12/2017 at 12:20. Pushed by apol into branch 'master'. Improve screenshots buttons Make it possible to navigate through them with left and right keys Hide them when there's no more screenshots Related: bug 387879 M +12 -4 discover/qml/ApplicationScreenshots.qml https://commits.kde.org/discover/f2c21e33547f7ed2e1ca9c659d0b62ac98d29c98