Re: Additional cleanup around xterm-mouse

[Jared Finder via "Emacs development discussions." <emacs-devel@gnu.org>]

On 2020-12-20 6:07 am, Stefan Monnier wrote:
>> I see a few options:
>> 
>> 1. Change the behavior of the dont-downcase-last parameter to this 
>> more
>>    extensive meaning.  Update global-set-key (the only other caller 
>> who sets
>>    dont-downcase-last in Emacs' code) to take this new behavior
>>    into account.
> 
> I believe `global-set-key` does want to use this new behavior, yes.
> 
>> 2. Make the dont-downcase-last parameter have the new behavior only if 
>> it is
>>    passed some new value (for example: 'all-fallbacks).  Leave the 
>> existing
>>   behavior for any other value, especially 'nil and 't.
>> 
>> 3. [My preference] Like 2, but with a deprecation message on values 
>> other
>>    than 'nil, 'all-fallbacks, or 't (or maybe 'downcase-last if we 
>> want full
>>    explicitness).  This allows maximal ability to define new behaviors 
>> in
>>   the future.
> 
> These sound good as well.  I'd even put a deprecation message on the
> `downcase-last` case.
> 
>> I like #3 as existing code would run unchanged.  The chance that any
>> existing code passed 'all-fallbacks is extremely low.  And anyone 
>> supporting
>> a package outside of Emacs passing some other value will notice the 
>> message
>> when they upgrade to Emacs 28.
>> 
>> Thoughts?
> 
> By order of preference, I'd say: #1, then #3 and finally #2.
> But any one of those 3 is OK for me.

Sounds good to me! Eli, do you have a preference here? I'd like to make 
sure I implement the right option.

   -- MJF