Fix for modifying an enumerated collection while traversing it. #8972
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The existing version of XRefCollection's ReaderCreator attempts to add items to a collection while it is traversing the same collection using foreach, causing an AggregateException. This error can be seen by having a simple xrefmap.yml file (referred to by "xref" in docfx.json) containing two redirections:
This pull request reverts to a previous form of the loop, allowing the collection to be changed while processing it. Additionally, it adds a couple of log statements to XRefMapDownloader, enabled via
--logLevel verbose, to allow the user to see which XRefMaps are being read.