Fix recently added n^2 edge collection #10392
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Problem
retain_edgesis crazy slow, but the simplicity of the API allured me late in the implementation of #10230, after I had finished testing the performance of the change.Solution
Switch to
filter_map, which we use elsewhere to good effect, and which a previous version of #10230 had used.Result
When repeatedly re-running tests with light edits, edge garbage collection goes from multiple seconds to single digit milliseconds.