opening an NSAlert while scanning an autosaved document now engenders the 
following log item:

NSAlert is being used from a background thread, which is not safe.  This is 
probably going to crash sometimes. Break on void 
_NSAlertWarnUnsafeBackgroundThreadUsage() to debug.  This will be logged only 
once.  This may break in the future.

this i have remedied. however, given the scenario where a url has vanished, i 
first show an NSAlert & then an NSOpenPanel to offer relink. NSOpenPanel causes 
no such background thread issue: do the two have variant thread safety? or is 
this likely to change in the future for NSOpenPanel, as well?
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