Numberfield only change in response to vertical scrolling (#1530)

* Numberfield only change in response to vertical scrolling

* fix test that was broken

Author: snowystinger

packages/@react-aria/numberfield/src/useNumberField.ts

@@ -123,7 +123,7 @@ export function useNumberField(props: AriaNumberFieldProps, state: NumberFieldSt
 
     if (e.deltaY > 0) {
       increment();
-    } else {
+    } else if (e.deltaY < 0) {
       decrement();
     }
   }, [isReadOnly, isDisabled, decrement, increment]);

packages/@react-spectrum/numberfield/test/NumberField.test.js

@@ -392,8 +392,6 @@ describe('NumberField', function () {
     act(() => {textField.focus();});
     fireEvent.wheel(textField, {deltaY: -10});
     expect(onChangeSpy).toHaveBeenCalledWith(-1);
-    fireEvent.wheel(textField, {deltaX: -10});
-    expect(onChangeSpy).toHaveBeenLastCalledWith(-2);
     act(() => {textField.blur();});
   });