defines the pattern for tree item filtering
The filterMode property is an object that can contain 3 attributes:
- showSubItems - (boolean) defines whether the tree should display children of the filtered items (true)
(even if they don't match the filtering condition). The default value - true.
- openParents - (boolean) - defines whether parents of the filtered items should be expanded (even if they don't match
the filtering condition) so that the user can effortlessly see the result of filtering. True by default.
- level - (number) sets the nesting level, the items from which will be filtered (one-based numbering).
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