SliverVisibiltyDetector should consider SliverConstraints overlap

[LaysDragon]

SliverVisibiltyDetector should consider SliverConstraints overlap

[LaysDragon]

I currently fix its manually by creating a OverlayRenderVisibilityDetectorBase with patched code in _determineVisibility method of RenderVisibilityDetectorBase

mixin OverlayRenderVisibilityDetectorBase on RenderSliver{
//...skipping some code
//...
  VisibilityInfo _determineVisibility(ContainerLayer? layer, Rect bounds) {
  //...skipping some code
  //...
    var info = VisibilityInfo.fromRects(
      key: key,
      widgetBounds: MatrixUtils.transformRect(transform, bounds),
      clipRect: clip,
    );

    switch (applyGrowthDirectionToAxisDirection(
      constraints.axisDirection,
      constraints.growthDirection,
    )) {
      case AxisDirection.down:
        info = VisibilityInfo(
          key: info.key,
          size: info.size,
          visibleBounds: Rect.fromLTRB(info.visibleBounds.left, info.visibleBounds.top + constraints.overlap,
              info.visibleBounds.right, info.visibleBounds.bottom),
        );
        if (info.visibleBounds.height <= 0) {
          return VisibilityInfo(
            key: key,
            size: info.size,
          );
        }
        break;
      case AxisDirection.up:
        info = VisibilityInfo(
          key: info.key,
          size: info.size,
          visibleBounds: Rect.fromLTRB(info.visibleBounds.left, info.visibleBounds.top, info.visibleBounds.right,
              info.visibleBounds.bottom - constraints.overlap),
        );
        if (info.visibleBounds.height <= 0) {
          return VisibilityInfo(
            key: key,
            size: info.size,
          );
        }
        break;
      case AxisDirection.right:
        info = VisibilityInfo(
          key: info.key,
          size: info.size,
          visibleBounds: Rect.fromLTRB(info.visibleBounds.left + constraints.overlap, info.visibleBounds.top,
              info.visibleBounds.right, info.visibleBounds.bottom),
        );
        if (info.visibleBounds.width <= 0) {
          return VisibilityInfo(
            key: key,
            size: info.size,
          );
        }
        break;
      case AxisDirection.left:
        info = VisibilityInfo(
          key: info.key,
          size: info.size,
          visibleBounds: Rect.fromLTRB(info.visibleBounds.left, info.visibleBounds.top,
              info.visibleBounds.right - constraints.overlap, info.visibleBounds.bottom),
        );
        if (info.visibleBounds.width <= 0) {
          return VisibilityInfo(
            key: key,
            size: info.size,
          );
        }
        break;
    }

    return info;
  }
}