HydrusPaths.MergeFile() does not guard against metadata timestamp like HydrusPaths.MirrorFile()

[bbappserver]

https://github.com/hydrusnetwork/hydrus/blob/18517d8a73b7fecaa7a5c8dcf61d30ccbfcb9b51/hydrus/core/HydrusPaths.py#L649`
https://docs.python.org/3/library/shutil.html#shutil.move

As of python 3.5 shutil.move() will fallback to copy_function when traversing volumes which defaults to copy2().
HydrusPaths.MergeFile() calls shutil.move(), but does not specify a copy_function so copy2 is always used if crossing a volumes. This differs from how MirrorFile() works as it checks against timestamps and chooses an appropriate copy function for windows.

[hydrusnetwork]

Thank you for this report. This is fixed for this week's release!