SUMMARY *** On mobile environment, I cannot scroll items in GlobalDrawer by flicking STEPS TO REPRODUCE 1. Install Kirigami Gallery from flatpak kdeapps 2. QT_QUICK_CONTROLS_MOBILE=true flatpak run org.kde.kirigami2.gallery 3. Open GlobalDrawer on the left 4. Reduce height of the window to have some items in the drawer hidden OBSERVED RESULT Observe that you can scroll using mouse wheel but not by holding some location (left mouse button pressed down) and flicking the drawer. Even the scrollbar on the drawer is not selectable by mouse EXPECTED RESULT I can flick the drawer up and down to choose hidden menu items SOFTWARE/OS VERSIONS KDE Application Platform org.kde.Platform 5.15-21.08 flathub Kirigami Gallery org.kde.kirigami2.gallery master kdeapps Sat 20 Aug 2022
Looks like running with QT_QUICK_CONTROLS_MOBILE=true QT_QUICK_CONTROLS_STYLE=Plasma flatpak run org.kde.kirigami2.gallery makes scroll bar selectable by mouse. But it is still impossible to flick.
This is actually intentional: when you use the mouse, you're not flicking at all, you're clicking and dragging. Clicking and dragging is different from flicking with a finger, and we have gotten bug reports about clicking and dragging performing a scroll unexpectedly. I can confirm that flicking with an actual finger on an actual touchscreen works here. So technically the issue you're seeing was a bugfix. :)
*** Bug 458131 has been marked as a duplicate of this bug. ***
OK, fair enough. I was not aware (or didn't recall to be more precise) of it. Thanks for looking into it.