branch scratch/mwheel-no-alts created (now f355557bb9e)

[Stefan Monnier]

monnier pushed a change to branch scratch/mwheel-no-alts.

        at  f355557bb9e mwheel.el: Code clean to reduce duplication

This branch includes the following new commits:

       new  ee2a8fd4cff (mouse-wheel-*-event): Minor cleanups
       new  a764b503e12 (mwheel--is-dir-p): New macro to reduce code duplication
       new  3bd8e963f7c * lisp/keymap.el (define-keymap): Demote "duplicate 
def" to a warning
       new  b9959e94d26 * lisp/completion-preview.el: Fix use in non-GUI session
       new  b0f04ce4d34 mwheel.el: Unconditionally use the `wheel-up/down/...` 
events
       new  8cb8b973653 mwheel.el: Remove `mouse-wheel-*-alternate-event` vars
       new  f355557bb9e mwheel.el: Code clean to reduce duplication