I understand that my program is doing it wrong. But is it normal to have an 
assertion failure, rather than an error return?



> On Apr 7, 2018, at 12:04 PM, Rob Petrovec <petr...@mac.com> wrote:
> 
> It’s saying that you are doing it wrong.  Utility windows cannot go full 
> screen.  You have yours set to go full screen.  It shouldn’t be.
> 
> —Rob
> 
> 
>> On Apr 7, 2018, at 10:24 AM, Alan Snyder <applemail832...@cbfiddle.com> 
>> wrote:
>> 
>> I am getting an assertion failure notice on the console when running a small 
>> test program:
>> 
>> Assertion failure in -[AWTWindow_Panel _validateCollectionBehavior:], 
>> /Library/Caches/com.apple.xbs/Sources/AppKit/AppKit-1504.83.101/AppKit.subproj/NSWindow.m:14741
>> 
>> (This message is on 10.12.6, the details are different on 10.13.)
>> 
>> When run under Xcode, there is more information: utility panels cannot be 
>> fullscreen primary
>> 
>> My question—does this represent a bug in AppKit that I should report, or is 
>> it trying to help me by explaining that my program provided an unsupported 
>> set of style bits when creating a window?
>> 
>> Alan
>> 
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