When exporting a large file, due to the way the auto reimporter only checks for the number of changed files has remained stable for some given threshold, it can kick in too early even though the single file is still being exported.

We should change this to be more intelligent about what's changed on the file-system (perhaps by using a last changed timestamp)

Steps to Reproduce

Export a large file that takes some considerable time

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ComponentUE - Editor - Framework - Import and Export
Affects Versions4.74.8
Target Fix4.8
Fix Commit2520873
CreatedApr 2, 2015
ResolvedApr 22, 2015
UpdatedApr 27, 2018