In document http://www.lorenzopantieri.net/LaTeX_files/ArteLaTeX.pdf sometimes when you highlight the text, the highlight colour exceeds the margins of the line as you can see from the following screenshot Reproducible: Always
Created attachment 89613 [details] screenshot
Confirming on Plasma desktop 5.5.5
The fact that you use plasma desktop or not is unrelated to okular at all, and since they are not released together the versioning you gave doesn't help either.
(In reply to Albert Astals Cid from comment #3) > The fact that you use plasma desktop or not is unrelated to okular at all, > and since they are not released together the versioning you gave doesn't > help either. Yes but I have also updated the component version