macsos: use ScrollEventUnit::LINE for mousewheel

Author: feschber

input-emulation/src/macos.rs

@@ -343,17 +343,18 @@ impl Emulation for MacOSEmulation {
                     event.post(CGEventTapLocation::HID);
                 }
                 PointerEvent::AxisDiscrete120 { axis, value } => {
+                    const LINES_PER_STEP: i32 = 3;
                     let (count, wheel1, wheel2, wheel3) = match axis {
-                        0 => (1, value, 0, 0), // 0 = vertical => 1 scroll wheel device (y axis)
-                        1 => (2, 0, value, 0), // 1 = horizontal => 2 scroll wheel devices (y, x) -> (0, x)
+                        0 => (1, value / (120 / LINES_PER_STEP), 0, 0), // 0 = vertical => 1 scroll wheel device (y axis)
+                        1 => (2, 0, value / (120 / LINES_PER_STEP), 0), // 1 = horizontal => 2 scroll wheel devices (y, x) -> (0, x)
                         _ => {
                             log::warn!("invalid scroll event: {axis}, {value}");
                             return Ok(());
                         }
                     };
                     let event = match CGEvent::new_scroll_event(
                         self.event_source.clone(),
-                        ScrollEventUnit::PIXEL,
+                        ScrollEventUnit::LINE,
                         count,
                         wheel1,
                         wheel2,