Created attachment 111629 [details] There is some extra space between calendar and the panel, because the panel on main screen is higher I use a dual screen setup with 2 panels on the main screen and 1 tiny panel on the second screen. Whenever I open a menu, krunner (or whatever it is called now) or any other popup (e.g. network applet or calendar as shown in the screenshot) on the secondary screen, there is some space left between the panel and popup, because padding fro screen edge is apparently calculated using the height of the panel on the main screen. This should not be the case.
Created attachment 111630 [details] Same situation with krunner
That is a limitation in the way reserved area works on X. The reserved region is a rectangle spanning all screens, this is unfixable. It is fixed and working on Wayland, however.