Updated grid pointer-events:undefined and tests

Author: Brian Vaughn

src/__tests__/FixedSizeGrid.js

@@ -155,7 +155,7 @@ describe('FixedSizeGrid', () => {
  <FixedSizeGrid {...defaultProps} />
  );
  const scrollContainer = findScrollContainer(rendered);
- expect(scrollContainer.props.style.pointerEvents).toBe('');
+ expect(scrollContainer.props.style.pointerEvents).toBe(undefined);
  rendered.getInstance().setState({ isScrolling: true });
  expect(scrollContainer.props.style.pointerEvents).toBe('none');
  });

src/__tests__/FixedSizeList.js

@@ -200,7 +200,7 @@ describe('FixedSizeList', () => {
  <FixedSizeList {...defaultProps} />
  );
  const scrollContainer = findScrollContainer(rendered);
- expect(scrollContainer.props.style.pointerEvents).toBe('');
+ expect(scrollContainer.props.style.pointerEvents).toBe(undefined);
  rendered.getInstance().setState({ isScrolling: true });
  expect(scrollContainer.props.style.pointerEvents).toBe('none');
  });

src/createGridComponent.js

@@ -432,7 +432,7 @@ export default function createGridComponent({
  ref: innerRef,
  style: {
  height: estimatedTotalHeight,
- pointerEvents: isScrolling ? 'none' : '',
+ pointerEvents: isScrolling ? 'none' : undefined,
  width: estimatedTotalWidth,
  },
  })

src/createListComponent.js

@@ -326,7 +326,7 @@ export default function createListComponent({
  ref: innerRef,
  style: {
  height: isHorizontal ? '100%' : estimatedTotalSize,
- pointerEvents: isScrolling ? 'none' : null,
+ pointerEvents: isScrolling ? 'none' : undefined,
  width: isHorizontal ? estimatedTotalSize : '100%',
  },
  })