Re: Some key binding in Emacs not properly work in mintty.

[Andy Koppe <andy.koppe@gmail.com>]

On 1 August 2010 16:17, Ken Brown wrote:
> On 8/1/2010 10:18 AM, Oleksandr Gavenko wrote:
>>
>> Selection by Ctrl-Left/Right/Down work properly.
>> But for Ctrl-Up Emacs say:
>>
>>    <select>  is undefined
>
> I can't reproduce this.  If it still happens after you update your Cygwin
> installation (see below), please give a step-by-step recipe for reproducing
> the problem.

Looks like Oleksandr meant Shift- rather than Ctrl-, because I do get
the "<select> is undefined" message with Shift-Up. Same thing happens
in xterm, so I don't know what's up with that.


>> Also I have trouble with<C-backspace>. Emacs think that
>> I press<undo>.
>
> I think this is a mintty issue.  I'll let Andy comment.

Unfortunately terminals don't have a standard keycode for
Ctrl+Backspace, hence in emacs it won't do what's expected in any of
them. In rxvt, it sends the same as plain Backspace. In xterm, it
sends ^H, which will invoke the help. In mintty, it sends ^_ (i.e.
0x1F), which will indeed invoke Undo.

This could be addressed by using the 'modifyOtherKeys' mode introduced
by xterm. This is enabled with '\e[>4;1m' and disabled with '\e[>4n'.
Apart from Backspace, it affects modifier combinations with Enter,
Tab, as well as number and symbol keys.

With modifyOtherKeys mode enabled, Ctrl+Backspace sends the following
keycode: '\e[127;5u'. (The 127 is the decimal ASCII code for ^?,
whereas the 5 indicates the Ctrl.)

I'm afraid I don't know how this could be put to use in emacs.

Andy

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