SUMMARY I noticed that "Save" icons (after it was added to toolbar) be active even if no thing was done (adding new annotations for example) to be saved ! STEPS TO REPRODUCE 1. add "Save" icon to Okular toolbar <okular_part> from "Configure Toolbars" under "Settings" 2. restart Okular 3. Try to open an e-book OBSERVED RESULT "Save" icons be active even if no thing was done (adding new annotations for example) to be saved ! EXPECTED RESULT "Save" icon should only be active when (after) there was(were) something added to be saved. SOFTWARE/OS VERSIONS Linux/KDE Plasma: Fedora Linux 30 X64 bit Cinnamon edition.
I test this on version 1.10 (flatpak from FlatHub) & still existing till now.