bug#57995: <wheel-right> with pixel-scroll-precision-mode

[Tak Kunihiro]

Without modifying break point, I got following results.

> (lldb) p horizontal
(bool) $0 = true
> (lldb) p emacs_event->kind
(event_kind) $1 = HORIZ_WHEEL_EVENT
> (lldb) p totalDeltaX

(int) $2 = 0

HTH

$ ./configure CFLAGS="-g -O0"
$ make
$ make install
$ lldb nextstep/Emacs.app/Contents/MacOS/Emacs
(lldb) br set --file src/nsterm.m --line 7363
(lldb) run -Q
M-: (setq mouse-wheel-tilt-scroll t)
M-: (pixel-scroll-precision-mode 1)
<wheel-right>
(lldb)
* thread #1, queue = 'com.apple.main-thread', stop reason = breakpoint 1.1
   frame #0: 0x000000010031f749 Emacs`-[EmacsView 
mouseDown:](self=0x0000000103023790, _cmd="mouseDown:", 
theEvent=0x0000600003706b80) at nsterm.m:7373:5
   7350 #if defined (NS_IMPL_GNUSTEP) || MAC_OS_X_VERSION_MIN_REQUIRED < 1070
   7351        {
   7352          CGFloat delta = [theEvent deltaY];
   7353          /* Mac notebooks send wheel events with delta equal to 0
   7354     when trackpad scrolling.  */
   7355          if (delta == 0)
   7356            {
   7357              delta = [theEvent deltaX];
   7358              if (delta == 0)
   7359                {
   7360                  NSTRACE_MSG ("deltaIsZero");
   7361                  return;
   7362                }
   7363              emacs_event->kind = HORIZ_WHEEL_EVENT;
   7364            }
   7365          else
   7366            emacs_event->kind = WHEEL_EVENT;
   7367
   7368          emacs_event->code = 0;
   7369          emacs_event->modifiers = EV_MODIFIERS (theEvent) |
   7370             ((delta > 0) ? up_modifier : down_modifier);
   7371         }
   7372 #endif
-> 7373     }
   7374   else
   7375     {
   7376       Lisp_Object tab_bar_arg = Qnil;
Target 0: (Emacs) stopped.
(lldb) p horizontal
(bool) $0 = true
(lldb) p emacs_event->kind
(event_kind) $1 = HORIZ_WHEEL_EVENT
(lldb) p totalDeltaX
(int) $2 = 0
(lldb)