Avoid appearance of short-lived temporary files in view #2221
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Fixes #2216
The issue is caused by the addition of a file to the model occuring after asynchronously getting the fileinfo so that it may get added after the file has been deleted. This PR fixes it by adding the file to the model before querying the info. In order to do this it is necessary to use the fallback method of determining whether it is a hidden file from the basename, but this should have little practical effect.