Hierarchies: Fix hierarchy filtering (#720)

iTwin · Oct 4, 2024 · e732356 · e732356
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diff --git a/.changeset/gorgeous-dingos-clap.md b/.changeset/gorgeous-dingos-clap.md
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+"@itwin/presentation-hierarchies": patch
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+Fixed iModel hierarchy provider returning unfiltered nodes after setting the hierarchy filter in certain scenarios.
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+The situation could happen when a new hierarchy filter is set during an ongoing nodes request. Then, requesting nodes immediately after setting the filter could return nodes from the previous request.
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+The change also slightly changes what happens with ongoing requests when hierarchy provider's internal state is reset: provider is disposed, the `imodelChanged` event is raised or hierarchy filter is set. Previously, it would continue handling all ongoing requests and return a valid result. Now, it will stop ASAP and return an empty list.