Hi, There are many users who would like to have a split view in Okular. Currently, using a QTabWidget I think implementing such a feature could be difficult. My proposal is to start using the Advanced Docking System for Qt <https://github.com/githubuser0xFFFF/Qt-Advanced-Docking-System> (ADS) to replace the QTabWidget and from that point work in the split view functionality.
In this small video ADS Integration <https://drive.google.com/open?id=1DGkTZIRNopy8feW5A03wJ50IKuBAahJO> you can see a small video of how it could look when using ADS. Please let me know what you think! P.S: Take into consideration that the video is just for showing the capabilities and not the final result.
