SUMMARY *** Recently when developing on neochat I noticed that the scrollbars were not being shown. This was happening on master, my patch branch and even on the release version after investigation. This seemed to coincide with an update to kirigami on my Neon Dev VM. I also saw that the scrollbar was missing in the left menu of the system settings app. The missing scrollbars were on the main window and room list of neochat, both scrollable pages. So going back through the commits I could see the recent one to port away from internal scrollview commit c28dff79721d3805edcd413ef233216b3b3b0104. By reverting this the scrollbars were restored. STEPS TO REPRODUCE 1. Update to latest kirigami master 2. Open neochat OBSERVED RESULT Scollbars missing for scrollable pages all the time EXPECTED RESULT Scrollbars should be visible when required SOFTWARE/OS VERSIONS Operating System: KDE neon Unstable Edition KDE Plasma Version: 5.25.80 KDE Frameworks Version: 5.97.0 Qt Version: 5.15.5 Kernel Version: 5.15.0-46-generic (64-bit) Graphics Platform: X11 Processor: 1 × AMD Ryzen 5 3600 6-Core Processor Memory: 3.8 GiB of RAM Graphics Processor: SVGA3D; build: RELEASE; LLVM; Manufacturer: innotek GmbH Product Name: VirtualBox System Version: 1.2 ADDITIONAL INFORMATION
It's actually a Qt bug; see Bug 456574. The Kirigami commit in question triggered this issue due to that Qt bug, and reverting that commit fixes it in some places, but not all. The real solution is to fix the Qt bug, and there is an open patch for it. *** This bug has been marked as a duplicate of bug 456574 ***