bug#43568: Horizontal mouse wheel scrolling

[Juri Linkov]

>>  (defcustom mouse-wheel-scroll-amount
>> -  '(5 ((shift) . 1) ((meta) . nil) ((control) . text-scale))
>> +  '(1 ((shift) . hscroll) ((meta) . nil) ((control) . text-scale))
> [...]
>
> If this patch is applied, this bug can be resolved:
> https://debbugs.gnu.org/cgi/bugreport.cgi?bug=43380

Thanks for referring to etc/TODO in bug#43380.

I wonder how relevant here are these TODO items?

  *** "Functional" function-key-map
  It would make it easy to add (and remove) mappings like
  "FOO-mouse-4 -> FOO-scroll-down"

  ** Ability to map a key, including all modified-combinations
  E.g map mouse-4 to wheel-up as well as M-mouse-4 -> M-wheel-up
  M-C-mouse-4 -> M-C-wheel-up, H-S-C-M-s-double-mouse-4 ->
  H-S-C-M-s-double-wheel-up, ...

  **** Automap ctrl-mouse-1 to mouse-3.

Perhaps not much relation to this feature, so this request can be closed.