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NSOpenPanel setCanChooseDirectories behavior

Hello,
I'm a bit puzzled by the behavior of setCanChooseDirectories of the NSOpenPanel.
If I open a panel like this:

NSOpenPanel panel = NSOpenPanel.openPanel();
panel.setCanChooseDirectories(false);
panel.setCanChooseFiles(true);
NSArray fileTypes = new NSArray(new String[]{"xyz"});
panel.beginSheetForDirectory(null,
null,
fileTypes,
window,
this,
new NSSelector("panelDidEnd", new Class[] {NSOpenPanel.class, int.class, Object.class}),
null);


then it is not possible to choose directories except their names end with ".xyz". For directories with ".xyz" at the end of their names the OK button is enabled. Is this behavior intended or is it a bug?

Thanks,
Christoph
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