Description

Fix #10524

How Has This Been Tested?

unit | visually
new test : DataGridNoRecordsContentVirtualizeTest.razor
new viewer test : DataGridVirtualizeServerDataLoadingWithSearchGroupableTest.razor

Type of Changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Documentation (fix or improvement to the website or code docs)

Checklist

• The PR is submitted to the correct branch (dev).
• My code follows the code style of this project.
• I've added relevant tests.

Additionnal note :

DataGridVirtualizeServerDataLoadingWithSearchGroupableTest.razor show grouping problem with Virtualize flag and didn't work - i says didn't work at all with Virtualize -

grouping must be done with the full data set and virtualization must do not refer to the same VirtualItemsProvider i guess because it reset actual grouping (set _currentRenderFilteredItemsCache to null)
BTW it didn't work on V7

cache cancellation

when i'm looking for the grouping problem i see that specific case : virtualize component can cancel the current chunk and then return empty result => which clear the grouping (because no data)

                //do not reset cache, the current chunk load has been cancelled, we wait for the final load
                if (!request.CancellationToken.IsCancellationRequested)
                {
                    _currentRenderFilteredItemsCache = null;
                }