Possible mouse wheel regression in -nw mode with PuTTY

Possible mouse wheel regression in -nw mode with PuTTY

[Neil Baylis]

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I think I'm seeing a slight regression in the behavior of the mouse wheel.
This is with -nw mode, using Windows PuTTY as a client, with ssh into a
linux box where the emacs runs. I've verified that it's nothing in my
init.el. I've verified that the bad behavior described below does not
happen when running on the same host with a real xterm.

The problem seems to have begun with emacs 24.4. I verified with fresh
builds from source that it works with 24.3, but not with 24.4

The problem:

 When I scroll using the mouse wheel, the buffer scrolls as before, but
there's also a screen flash, and a complaint in the mini buffer: "M-[ m" is
undefined". It seems that emacs is seeing this escape sequence after each
movement of the mouse wheel. I have PuTTY set to report xterm mouse events,
and I have xterm-mouse-mode turned on in emacs. I also executed some of the
new terminal mode menu features, and saw the problem there as well, so I'm
guessing that this new facility introduced the problem. Ordinary mouse
clicks do the right thing.

I can work around this by adding a global-set-key to recognize the escape
sequence and ignore it. As yet, I don't know if my workaround breaks
anything else. The escape sequence means "Turn off all special character
attributes, e.g., blinking, bold, etc.".

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Re: Possible mouse wheel regression in -nw mode with PuTTY

[Stefan Monnier]

>  When I scroll using the mouse wheel, the buffer scrolls as before, but
> there's also a screen flash, and a complaint in the mini buffer: "M-[ m" is
> undefined". It seems that emacs is seeing this escape sequence after each

Please report this as a bug (e.g. M-x report-emacs-bug) and include the
C-h l output right after a few problematic mouse-wheel scrolls.

Extra points if you include the same C-h l output after the same
mouse-wheel scrolls in 24.3 where the problem doesn't show up.


        Stefan