Fix time graph filtering and collapsing #1131
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Update the filtering of empty nodes to include visible nodes even if any of their parent is filtered-out. Recursively replace filtered-out nodes by their visible children, if any, but only if the filtered-out parent node is not collapsed.
In TimeGraphOutputComponent update the arrows layer after empty nodes have been determined, and filter out empty nodes from the rowIds passed to the arrows layer.
Fixes #1132