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bug#4124: 23.1; mwheel in --daemon mode

From: Dan Nicolaescu
Subject: bug#4124: 23.1; mwheel in --daemon mode
Date: Tue, 11 Aug 2009 10:27:48 -0700 (PDT)

John Prevost <address@hidden> writes:

  > Please write in English if possible, because the Emacs maintainers
  > usually do not have translators to read other languages for them.
  > Your bug report will be posted to the address@hidden mailing list,
  > and to the gnu.emacs.bug news group.
  > Please describe exactly what actions triggered the bug
  > and the precise symptoms of the bug:
  > When emacs is started in --daemon mode, the window-system variable is
  > initially 'nil'.  In mwheel.el, mouse-wheel-down-event and
  > mouse-wheel-up-event are bound with defcustom declarations like the
  > following:
  > (defcustom mouse-wheel-down-event
  >   ;; In the latest versions of XEmacs, we could just use mouse-%s as well.
  >   (if (memq window-system '(w32 ns))

In emacs-23 uses of window-system to initialize variables are most of
the time bugs because window-system is not a constant anymore.  Its
value depends of the frame it is used in, and we can have TTY and GUI
frames in the same emacs sessions, so...

  >       'wheel-up
  >     (intern (format (if (featurep 'xemacs) "button%s" "mouse-%s")
  >                 mouse-wheel-down-button)))
  >   "Event used for scrolling down."
  >   :group 'mouse
  >   :type 'symbol
  >   :set 'mouse-wheel-change-button)
  > Since these run before any terminal is created in the --daemon case,
  > window-system may not be set to anything at all.
  > It is possible that this is a bug in mwheel, and that mwheel (and other
  > packages) should take care not to make use of the window-system variable
  > until startup.  (This may be particularly important if it's possible for
  > a single emacs binary to have support for multiple window systems.)
  > It is possible that a better solution to the problem that mwheel solves
  > above would be for either term/x-win.el to define-key mouse-4 and
  > mouse-5 to wheel-up and wheel-down, or for term/w32-win.el and
  > term/ns-win.el to define-key wheel-up and wheel-down to mouse-4 and
  > mouse-5, so that mwheel and other packages can use the same symbol on
  > all window systems.
  > Either way, the current state of the world is that --daemon results in a
  > non-functional mouse wheel on w32 and ns.

w32 does not use the daemon mode, nor can it use TTY and w32 frames at
the same time, so it should not matter.

What happens on ns if you take the `ns' out of the memq test above, does
it make it work?  (I don't have a mouse with a wheel, nor ns ...)

  > If Emacs crashed, and you have the Emacs process in the gdb debugger,
  > please include the output from the following gdb commands:
  >     `bt full' and `xbacktrace'.
  > If you would like to further debug the crash, please read the file
 for instructions.
  > In GNU Emacs 23.1.1 (i386-apple-darwin9.7.0, NS apple-appkit-949.46)
  >  of 2009-08-07 on TELPERION.WV.CC.CMU.EDU
  > Windowing system distributor `Apple', version 10.3.949
  > configured using `configure  '--prefix=/opt/emacs-23.1' '--with-ns''
  > Important settings:
  >   value of $LC_ALL: nil
  >   value of $LC_COLLATE: nil
  >   value of $LC_CTYPE: nil
  >   value of $LC_MESSAGES: nil
  >   value of $LC_MONETARY: nil
  >   value of $LC_NUMERIC: nil
  >   value of $LC_TIME: nil
  >   value of $LANG: nil
  >   value of $XMODIFIERS: nil
  >   locale-coding-system: nil
  >   default-enable-multibyte-characters: t
  > Major mode: Fundamental
  > Minor modes in effect:
  >   diff-auto-refine-mode: t
  >   tooltip-mode: t
  >   tool-bar-mode: t
  >   mouse-wheel-mode: t
  >   menu-bar-mode: t
  >   file-name-shadow-mode: t
  >   global-font-lock-mode: t
  >   global-auto-composition-mode: t
  >   auto-encryption-mode: t
  >   auto-compression-mode: t
  >   line-number-mode: t
  >   transient-mark-mode: t
  > Recent input:
  > <help-echo> s-x r e p o r t M-x r e p o t <backspace> 
  > r t - e m <tab> <return>
  > Recent messages:
  > Loading /Users/prevost1/Documents/src/elisp/nxml-mode/rng-auto.el 
  > Loading /Users/prevost1/Documents/src/elisp/mercurial.el (source)...done
  > For information about GNU Emacs and the GNU system, type C-h C-a.
  > Terminal setup done
  > kill-region: The mark is not set now, so there is no region

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