Open Radar

 
Summary:
If I add a child window to a semi-transient popover window, then I can't close the popover anymore by clicking outside of the window.

Steps to Reproduce:
Here is a little snippet to reproduce the problem:

@interface SMAppDelegate () <NSApplicationDelegate, NSPopoverDelegate>

@property (assign) IBOutlet NSWindow *window;
@property (weak) IBOutlet NSPopover *popover;
@property (weak) IBOutlet NSView *popoverView;

@end

@implementation SMAppDelegate

- (IBAction)openPopover:(id)sender {
	[self.popover showRelativeToRect:[sender bounds] ofView:sender preferredEdge:NSMinYEdge];
}

- (void)popoverDidShow:(NSNotification *)notification {
	// get window of the popover
	NSWindow *window = self.popoverView.window;
	
	// create overlay window
	NSWindow *overlayWindow = [[NSWindow alloc] initWithContentRect:window.frame
														  styleMask:NSBorderlessWindowMask
															backing:NSBackingStoreBuffered
															  defer:NO];
	
	overlayWindow.backgroundColor = [NSColor colorWithCalibratedRed:1.0 green:0.0 blue:0.0 alpha:0.4];
	overlayWindow.opaque = NO;
	overlayWindow.hasShadow = NO;
	
	overlayWindow.acceptsMouseMovedEvents = NO;
	overlayWindow.ignoresMouseEvents = YES;
	
	// you can't close the popover if you added a child window
	[window addChildWindow:overlayWindow ordered:NSWindowAbove];
}

@end