The 'tablet_tool_wheel' function for tablet scrolling was added back in 8a1defcc634 but left unimplemented. This commit fills in the necessary details, using the "clicks" count as the number of discrete scroll up/down events to send.
7c7a540 xwayland: Implement tablet_tool_wheel for scrolling
hw/xwayland/xwayland-input.c | 24 ++++++++++++++++++++++++
hw/xwayland/xwayland.h | 2 ++
2 files changed, 26 insertions(+)