Set window delegate to nil before we disappear

There are places where we iterate through the delegates of NSApp’s ordered windows. Since the window may stay around longer than it’s (NSWindowController) delegate, we should be sure to set NSWindow’s delegate property to nil.

Frameworks/HTMLOutputWindow/src/HTMLOutputWindow.mm

@@ -112,4 +112,9 @@ static std::multimap<oak::uuid_t, HTMLOutputWindowController*> Windows;
 	[alert beginSheetModalForWindow:self.window modalDelegate:self didEndSelector:@selector(closeWarningDidEnd:returnCode:contextInfo:) contextInfo:NULL];
 	return NO;
 }
+
+- (void)dealloc
+{
+	self.window.delegate = nil;
+}
 @end