Query object containing all the selection rules. Can be saved and rerun later without re-allocating memory.
| AtIndex | Selects the n th element matching all the criteria, or null if not enough elements were found. |
| First | The first element matching all the criteria, or null if none was found. |
| ForEach | Invokes function on all elements matching the query. |
| Last | The last element matching all the criteria, or null if none was found. |
| RebuildOn | Creates a new QueryState with the same selection rules, applied on another VisualElement. |
| ToList | Returns a list containing elements satisfying selection rules. |
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