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

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

[Tak Kunihiro]

pixel-scroll-precision-mode is very nice.  I appreciate Po Lu to work
on this.

With pixel-scroll-precision-mode, <wheel-right> and <wheel-left> does
not work. Is this expected behavior?

1. emacs -Q
2. (setq mouse-wheel-tilt-scroll t)
3. <wheel-right> or <wheel-left> scrolls buffer.
4. (pixel-scroll-precision-mode 1)
5. Then <wheel-right> or <wheel-left> does not scroll buffer.

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

[Po Lu via Bug reports for GNU Emacs, the Swiss army knife of text editors]

Tak Kunihiro <tkk@misasa.okayama-u.ac.jp> writes:

> pixel-scroll-precision-mode is very nice.  I appreciate Po Lu to work
> on this.
>
> With pixel-scroll-precision-mode, <wheel-right> and <wheel-left> does
> not work. Is this expected behavior?
>
> 1. emacs -Q
> 2. (setq mouse-wheel-tilt-scroll t)
> 3. <wheel-right> or <wheel-left> scrolls buffer.
> 4. (pixel-scroll-precision-mode 1)
> 5. Then <wheel-right> or <wheel-left> does not scroll buffer.

Thanks for reporting this bug.  Could you please include the output from
`report-emacs-bug', as this is likely a system-specific issue?

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

[Tak Kunihiro]

>> With pixel-scroll-precision-mode, <wheel-right> and <wheel-left> does
>> not work. Is this expected behavior?
>> 
>> 1. emacs -Q
>> 2. (setq mouse-wheel-tilt-scroll t)
>> 3. <wheel-right> or <wheel-left> scrolls buffer.
>> 4. (pixel-scroll-precision-mode 1)
>> 5. Then <wheel-right> or <wheel-left> does not scroll buffer.
> 
> Thanks for reporting this bug.  Could you please include the output from
> `report-emacs-bug', as this is likely a system-specific issue?

No buffer scroll with <wheel-right> and <wheel-left> by mouse with Mac.
I confirm that I can scroll buffer with swipe-right and swipe-left by
touchpad with MacBook.

TIA


In GNU Emacs 29.0.50 (build 5, x86_64-apple-darwin21.6.0, NS
 appkit-2113.60 Version 12.6 (Build 21G115)) of 2022-09-26 built on
 DreamMini2019.local
Repository revision: 9ed03040d5bfb228c8d41f1df44e74a824d0cd44
Repository branch: master
Windowing system distributor 'Apple', version 10.3.2113
System Description:  macOS 12.6

Configured features:
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THREADS TOOLKIT_SCROLL_BARS WEBP XIM ZLIB

Important settings:
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  value of $LANG: en_US.UTF-8
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Major mode: Lisp Interaction

Minor modes in effect:
  pixel-scroll-precision-mode: t
  tooltip-mode: t
  global-eldoc-mode: t
  eldoc-mode: t
  show-paren-mode: t
  electric-indent-mode: t
  mouse-wheel-mode: t
  tool-bar-mode: t
  menu-bar-mode: t
  file-name-shadow-mode: t
  global-font-lock-mode: t
  font-lock-mode: t
  blink-cursor-mode: t
  line-number-mode: t
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bug#57995: <wheel-right> with pixel-scroll-precision-mode

[Po Lu via Bug reports for GNU Emacs, the Swiss army knife of text editors]

Tak Kunihiro <tkk@misasa.okayama-u.ac.jp> writes:

>>> With pixel-scroll-precision-mode, <wheel-right> and <wheel-left> does
>>> not work. Is this expected behavior?
>>> 
>>> 1. emacs -Q
>>> 2. (setq mouse-wheel-tilt-scroll t)
>>> 3. <wheel-right> or <wheel-left> scrolls buffer.
>>> 4. (pixel-scroll-precision-mode 1)
>>> 5. Then <wheel-right> or <wheel-left> does not scroll buffer.
>> 
>> Thanks for reporting this bug.  Could you please include the output from
>> `report-emacs-bug', as this is likely a system-specific issue?
>
> No buffer scroll with <wheel-right> and <wheel-left> by mouse with Mac.
> I confirm that I can scroll buffer with swipe-right and swipe-left by
> touchpad with MacBook.

Right, thanks.  Could you please run Emacs underneath a debugger (GDB or
LLDB), and see whether or not this code around line 7342 of nsterm.m is
ever hit:

          CGFloat delta = [theEvent deltaY];
          /* Mac notebooks send wheel events with delta equal to 0
	     when trackpad scrolling.  */
          if (delta == 0)
            {
              delta = [theEvent deltaX];
              if (delta == 0)
                {
                  NSTRACE_MSG ("deltaIsZero");
                  return;
                }
              emacs_event->kind = HORIZ_WHEEL_EVENT; <================
            }
          else
            emacs_event->kind = WHEEL_EVENT;

          emacs_event->code = 0;
          emacs_event->modifiers = EV_MODIFIERS (theEvent) |
            ((delta > 0) ? up_modifier : down_modifier);

when you try to scroll left or right with your mouse while
pixel-scroll-precision-mode is enabled?

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

[Tak Kunihiro]

I do not know how to call debugger.
It will take a while to respond!

>>>> With pixel-scroll-precision-mode, <wheel-right> and <wheel-left> does
>>>> not work. Is this expected behavior?
>>>> 
>>>> 1. emacs -Q
>>>> 2. (setq mouse-wheel-tilt-scroll t)
>>>> 3. <wheel-right> or <wheel-left> scrolls buffer.
>>>> 4. (pixel-scroll-precision-mode 1)
>>>> 5. Then <wheel-right> or <wheel-left> does not scroll buffer.
>>> 
>>> Thanks for reporting this bug.  Could you please include the output from
>>> `report-emacs-bug', as this is likely a system-specific issue?
>>
>> No buffer scroll with <wheel-right> and <wheel-left> by mouse with Mac.
>> I confirm that I can scroll buffer with swipe-right and swipe-left by
>> touchpad with MacBook.
> 
> Right, thanks.  Could you please run Emacs underneath a debugger (GDB or
> LLDB), and see whether or not this code around line 7342 of nsterm.m is
> ever hit:
> 
>           CGFloat delta = [theEvent deltaY];
>           /* Mac notebooks send wheel events with delta equal to 0
> 	     when trackpad scrolling.  */
>           if (delta == 0)
>             {
>               delta = [theEvent deltaX];
>               if (delta == 0)
>                 {
>                   NSTRACE_MSG ("deltaIsZero");
>                   return;
>                 }
>               emacs_event->kind = HORIZ_WHEEL_EVENT; <================
>             }
>           else
>             emacs_event->kind = WHEEL_EVENT;
> 
>           emacs_event->code = 0;
>           emacs_event->modifiers = EV_MODIFIERS (theEvent) |
>             ((delta > 0) ? up_modifier : down_modifier);
> 
> when you try to scroll left or right with your mouse while
> pixel-scroll-precision-mode is enabled?

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

[Po Lu via Bug reports for GNU Emacs, the Swiss army knife of text editors]

Tak Kunihiro <tkk@misasa.okayama-u.ac.jp> writes:

> I do not know how to call debugger.
> It will take a while to respond!

Does that mean the debugger freezes?  I'm not sure what you mean here.

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

[Tak Kunihiro]

I set a break point to line 7363 and run Emacs.  Event <wheel-left>
stops at line 7373.  I'm not familiar with neither lldb and gdb.  Please
tell me the next step specifically.

TIA

$ ./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.

> I do not know how to call debugger.
> It will take a while to respond!
>
>>>>> With pixel-scroll-precision-mode, <wheel-right> and <wheel-left> does
>>>>> not work. Is this expected behavior?
>>>>> 
>>>>> 1. emacs -Q
>>>>> 2. (setq mouse-wheel-tilt-scroll t)
>>>>> 3. <wheel-right> or <wheel-left> scrolls buffer.
>>>>> 4. (pixel-scroll-precision-mode 1)
>>>>> 5. Then <wheel-right> or <wheel-left> does not scroll buffer.
>>>> 
>>>> Thanks for reporting this bug.  Could you please include the output from
>>>> `report-emacs-bug', as this is likely a system-specific issue?
>>>
>>> No buffer scroll with <wheel-right> and <wheel-left> by mouse with Mac.
>>> I confirm that I can scroll buffer with swipe-right and swipe-left by
>>> touchpad with MacBook.
>> 
>> Right, thanks.  Could you please run Emacs underneath a debugger (GDB or
>> LLDB), and see whether or not this code around line 7342 of nsterm.m is
>> ever hit:
>> 
>>           CGFloat delta = [theEvent deltaY];
>>           /* Mac notebooks send wheel events with delta equal to 0
>> 	     when trackpad scrolling.  */
>>           if (delta == 0)
>>             {
>>               delta = [theEvent deltaX];
>>               if (delta == 0)
>>                 {
>>                   NSTRACE_MSG ("deltaIsZero");
>>                   return;
>>                 }
>>               emacs_event->kind = HORIZ_WHEEL_EVENT; <================
>>             }
>>           else
>>             emacs_event->kind = WHEEL_EVENT;
>> 
>>           emacs_event->code = 0;
>>           emacs_event->modifiers = EV_MODIFIERS (theEvent) |
>>             ((delta > 0) ? up_modifier : down_modifier);
>> 
>> when you try to scroll left or right with your mouse while
>> pixel-scroll-precision-mode is enabled?

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

[Po Lu via Bug reports for GNU Emacs, the Swiss army knife of text editors]

Tak Kunihiro <homeros.misasa@gmail.com> writes:

> I set a break point to line 7363 and run Emacs.  Event <wheel-left>
> stops at line 7373.  I'm not familiar with neither lldb and gdb.  Please
> tell me the next step specifically.
>
> TIA
>
> $ ./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.

Thanks.  I just realized that the code I asked you to break on is not
defined on your system.

Would you please print out the values of the following variables
instead?

  (lldb) p horizontal
  (lldb) p emacs_event->kind
  (lldb) p totalDeltaX

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)

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

[Po Lu via Bug reports for GNU Emacs, the Swiss army knife of text editors]

Tak Kunihiro <tak.kunihiro@gmail.com> writes:

> 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

Would you please print the contents of the following variables as well?

  (lldb) p emacs_event->modifiers
  (lldb) p scrollUp
  (lldb) p delta

TIA.

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

[Tak Kunihiro]

I typed in the results.

>  (lldb) p emacs_event->modifiers
(unsigned int) $0 = 2
>  (lldb) p scrollUp
(int) $1 = 0
>  (lldb) p delta
error: expression failed to parse:
error: <user expression 2>:1:1: use of undeclared identifier 'delta'
delta
^

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
  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) p emacs_event->modifiers
(unsigned int) $0 = 2
(lldb) p scrollUp
(int) $1 = 0
(lldb) p delta
error: expression failed to parse:
error: <user expression 2>:1:1: use of undeclared identifier 'delta'
delta
^
(lldb)

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

[Po Lu via Bug reports for GNU Emacs, the Swiss army knife of text editors]

Tak Kunihiro <tak.kunihiro@gmail.com> writes:

> I typed in the results.
>
>>  (lldb) p emacs_event->modifiers
> (unsigned int) $0 = 2
>>  (lldb) p scrollUp
> (int) $1 = 0
>>  (lldb) p delta
> error: expression failed to parse:
> error: <user expression 2>:1:1: use of undeclared identifier 'delta'
> delta

Rright... what if you replace "delta" with "[theEvent scrollingDeltaX]"?

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

[Tak Kunihiro]

> (lldb) p [theEvent scrollingDeltaX]
(CGFloat) $0 = -1

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
 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) p emacs_event->modifiers
(unsigned int) $0 = 2
(lldb) p scrollUp
(int) $1 = 0
(lldb) p delta
error: expression failed to parse:
error: <user expression 2>:1:1: use of undeclared identifier 'delta'
delta
^
(lldb) p [theEvent scrollingDeltaX]
(CGFloat) $0 = -1
(lldb)

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

[Po Lu via Bug reports for GNU Emacs, the Swiss army knife of text editors]

Tak Kunihiro <tak.kunihiro@gmail.com> writes:

>> (lldb) p [theEvent scrollingDeltaX]
> (CGFloat) $0 = -1
>
> HTH

That looks completely normal!

I am lost here.  I will try to reproduce this on a Macbook tomorrow.

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

[Stefan Kangas]

Po Lu <luangruo@yahoo.com> writes:

> Tak Kunihiro <tak.kunihiro@gmail.com> writes:
>
>>> (lldb) p [theEvent scrollingDeltaX]
>> (CGFloat) $0 = -1
>>
>> HTH
>
> That looks completely normal!
>
> I am lost here.  I will try to reproduce this on a Macbook tomorrow.

Po Lu, did you make any progress with this bug?

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

[Po Lu via Bug reports for GNU Emacs, the Swiss army knife of text editors]

Stefan Kangas <stefankangas@gmail.com> writes:

> Po Lu <luangruo@yahoo.com> writes:
>
>> Tak Kunihiro <tak.kunihiro@gmail.com> writes:
>>
>>>> (lldb) p [theEvent scrollingDeltaX]
>>> (CGFloat) $0 = -1
>>>
>>> HTH
>>
>> That looks completely normal!
>>
>> I am lost here.  I will try to reproduce this on a Macbook tomorrow.
>
> Po Lu, did you make any progress with this bug?

I don't remember.  Tak, are you still experiencing this?

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

[Tak Kunihiro]

>>>>> (lldb) p [theEvent scrollingDeltaX]
>>>> (CGFloat) $0 = -1
>>>>
>>>> HTH
>>>
>>> That looks completely normal!
>>>
>>> I am lost here.  I will try to reproduce this on a Macbook tomorrow.
>>
>> Po Lu, did you make any progress with this bug?
>
> I don't remember.  Tak, are you still experiencing this?

I checked on the following build and I do not see the problem.
I think that it is fixed.

GNU Emacs 29.1 (build 1, x86_64-apple-darwin18.7.0, NS appkit-1671.60
 Version 10.14.6 (Build 18G9323)) of 2023-07-30

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

[Po Lu via Bug reports for GNU Emacs, the Swiss army knife of text editors]

Tak Kunihiro <tkk@misasa.okayama-u.ac.jp> writes:

>>>>>> (lldb) p [theEvent scrollingDeltaX]
>>>>> (CGFloat) $0 = -1
>>>>>
>>>>> HTH
>>>>
>>>> That looks completely normal!
>>>>
>>>> I am lost here.  I will try to reproduce this on a Macbook tomorrow.
>>>
>>> Po Lu, did you make any progress with this bug?
>>
>> I don't remember.  Tak, are you still experiencing this?
>
> I checked on the following build and I do not see the problem.
> I think that it is fixed.
>
> GNU Emacs 29.1 (build 1, x86_64-apple-darwin18.7.0, NS appkit-1671.60
>  Version 10.14.6 (Build 18G9323)) of 2023-07-30

Closing, thank you.