() Yuri Khan <yuri.v.khan@gmail.com>
() Fri, 2 Jun 2017 11:55:15 +0700

   I wonder how and why that feature evolved?

IIRC (corrections welcome) way beck when, there was only the ‘d’
(key) producing ‘D’ in the left margin.  The other keys, letters
and symbols were a generalization that avoided subsuming ‘d’/‘D’
because such force is uncouth to long-time users' muscle-memory.

-- 
Thien-Thi Nguyen -----------------------------------------------
 (defun responsep (query)
   (pcase (context query)
     (`(technical ,ml) (correctp ml))
     ...))                              748E A0E8 1CB8 A748 9BFA
--------------------------------------- 6CE4 6703 2224 4C80 7502