src/vs/workbench/contrib/debug/browser/loadedScriptsView.ts/LoadedScriptsFilter/filter
class LoadedScriptsFilter:	filter(element: BaseTreeItem, parentVisibility: TreeVisibility): TreeFilterResult<FuzzyScore> {

		if (!this.filterText) {
			return TreeVisibility.Visible;
		}

		if (element.isLeaf()) {
			const name = element.getLabel();
			if (name.indexOf(this.filterText) >= 0) {
				return TreeVisibility.Visible;
			}
			return TreeVisibility.Hidden;
		}
		return TreeVisibility.Recurse;
	}