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Carefully suggesting a previous location to a save panel
NSSavePanel *savePanel = [NSSavePanel savePanel];
NSURL *url = [self mostRecentlySavedToURL];
NSURL *parentDirectory = [url URLByDeletingLastPathComponent];
NSNumber *isDirectory;
if ([parentDirectory getResourceValue:&isDirectory forKey:NSURLIsDirectoryKey error:NULL] &&
[isDirectory boolValue])
{
[savePanel setDirectoryURL:parentDirectory];
}
[savePanel setNameFieldStringValue:[url lastPathComponent]];
// Finish configuring and run the save panel
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