[Bug]: SortAndVirtualize emits all items if the virtual request window size is 0.

[Snailya]

Describe the bug 🐞

For some scenario that requires lazy load, an initial virtualize window size 0 is expected. However, when a virtual request has size of 0, the SortAndVirtualize will ignore the request and emit all items to downstream.

I think this is the code that caused this problem, if the size is 0, the request is ignored.

var paramsChanged = _virtualRequests.Synchronize(locker)
                    .DistinctUntilChanged()
                    // exclude dodgy params
                    .Where(parameters => parameters is { StartIndex: >= 0, Size: > 0 })
                    .Select(request =>
                    {
                        virtualParams = request;

                        // have not received the comparer yet
                        if (applicator is null) return Empty;

                        // re-apply virtual changes
                        return ApplyVirtualChanges();
                    });

Step to reproduce

1. Go to '...'
2. Click on '....'
3. Scroll down to '....'
4. See error

Reproduction repository

https://github.com/Snailya/SortAndVirtualizeTest

Expected behavior

if size 0 is allowed, the downstream should have no item.
if not, a validation for the size is need to notify the coder.

Screenshots 🖼️

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IDE

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Operating system

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Version

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Device

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DynamicData Version

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Additional information ℹ️

No response