(disclaimer: This is a summary of a meeting discussion) The new sidebar component allows a compact always visible vertical bar. This is perfect to replace Ring-KDE hardcoded sidebar/dock component. One feature I wish to have is the ability to "pin" the expanded sidebar to stay open. The idea to the place the timeline and other "QDockWidget" equivalent. I no not need to have more than 1 visible at once. This would make the UX confusing and it's not necessary. The only change compared to the current state is to have a button to "pin" the expanded drawer to stay open and reserve it's space instead of being an overlay.
Discover already uses the sidebar this way, BTW.
the current expanding sidebar in master should behave like that. can you check if it's suited to your needs?
I will take a look, I am back from vacation today. For the next week I will work on integrating the changes. Thanks for fixing these issues. If you can also take a look at the header one, hopefully I will be able to release 3.0.1 during Akademy with less custom code. See ya at Akademy (I am already in VIE)