bug#23924: 25.1.50; Emacs NSInternalInconsistencyException on macos Sierra developer beta 2

[Bob Halley]

> Is it a bad thing to just always set send_appdefined=YES?  The code appears 
> to be trying to suppress appdefined events in some cases, but it's not clear 
> to me what happens if we stop trying to send only one.  Naively I'd think 
> "why not, so the run loop gets stopped twice, it's a little extra work" but I 
> don't know this code and am not familiar with the macOS API :)

FWIW, I made my emacs just always have send_appdefined=YES and nothing 
obviously bad has happened so far.