Open Radar

 
Summary:
Invoking a dictionary popup by calling -[NSView showDefinitionForAttributedString:atPoint:] does not work if the view's NSWindow has a backgroundColor that is a custom subclass of NSColor.

Steps to Reproduce:
1. Compile and run the attached code file as indicated at the top of the file.
2. Click anywhere in the window that opens.

or, alternatively:

1. Create a subclass of NSColor.
2. Create an instance of that subclass, and call [yourNSWindow setBackgroundColor:yourColor] with it.
3. For any NSView inside that window, call [yourNSView showDefinitionForAttributedString:yourString atPoint:yourPoint];

Expected Results:
A dictionary lookup panel should open, describing the supplied string.

Actual Results:
No panel is opened. The following error is printed to the console:
Lookup: Unhandled exception 'NSObjectNotAvailableException' caught in -[LULookupDefinitionModule showDefinitionForString:range:options:originProvider:inView:]

In the system console, there is an additional error from inside LookupViewService, the important part being:
Exception: decodeObjectForKey: class "MyColor" not loaded or does not exist

The full error message is:
2016-05-25 3:05:03.512 PM LookupViewService[95935]: <NSXPCConnection: 0x7f92306338e0> connection from pid 95934: Warning: Exception caught during decoding of received message, dropping incoming message.
Exception: Exception while decoding argument 0 (#2 of invocation):
<NSInvocation: 0x7f9232829520>
return value: {v} void
target: {@} 0x0
selector: {:} bootstrap:withReply:
argument 2: {{?=@@@@{CGRect={CGPoint=dd}{CGSize=dd}}Icc@@@}} <00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000>
argument 3: {@?} 0x0 (block)

Exception: decodeObjectForKey: class "MyColor" not loaded or does not exist


Version:
Version 7.3.1 (7D1014) & 10.11.6 Beta (15G7a)

Notes:
We have to work around this in Firefox, because we use a custom window background color.

Configuration:
This occurs on all versions of Mac OS 10.11, as far as I know. It sounds like it did not occur on 10.10, but I have not verified that part.

Attachments:
'main.mm' was successfully uploaded.