Function write_mouse_wheel_events_system

pub fn write_mouse_wheel_events_system(
    modifier_keys_state: Res<'_, ModifierKeysState>,
    hovered_non_window_egui_context: Option<Res<'_, HoveredNonWindowEguiContext>>,
    mouse_wheel_reader: EventReader<'_, '_, MouseWheel>,
    egui_input_event_writer: EventWriter<'_, EguiInputEvent>,
    egui_contexts: Query<'_, '_, &EguiContextSettings, With<EguiContext>>,
)

Reads MouseWheel events and wraps them into EguiInputEvent, can redirect events to HoveredNonWindowEguiContext.