NetNews Usenet Archive 1992 #16/NN_1992_16.iso/spool/alt/lucidem/help/153

Text File | 1992-07-27 | 1.7 KB | 40 lines

Newsgroups: alt.lucid-emacs.help
Sender: [e-mail]
Date: Mon, 27 Jul 92 18:29:46 PDT
From: [e-mail] (Eric Benson)
Message-ID: <[e-mail]>
Subject: Re: Change in point movement behavior
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Path: sparky!uunet!wendy-fate.uu.net!help-lucid-emacs
Lines: 27

In Emacs 18 the cursor keys actually send the characters C-n and C-p
to Emacs.  In lemacs they are the X keysyms 'up and 'down.  We had
originally bound these keys to the commands previous-line and
next-line, but that doesn't work well for modes with local bindings
for C-n and C-p, since people usually expect the cursor keys to do
exactly the same thing as C-b, C-f, C-p and C-n, regardless of what
those keys are bound to.  So, we changed the cursor key bindings to be
keyboard macros containing exactly those characters instead.  This
works fine, except that next-line and previous-line check the variable
last-command to decide if it should keep the goal column at the same
place, and apparently the keyboard macro was causing this to fail.
However, it turns out that Emacs 18 has this extra special hack to
make keyboard macros containing exactly one character set last-command
to the command to which the character is bound.  Lemacs didn't have
this hack, so I added it.  It will appear in 19.3, but if you want it
now, in command_loop_1 in keyboard.c, change the line

  Vlast_command = Qt;

to

  if (!(!NILP(Vexecuting_macro) &&
    ((XTYPE (Vexecuting_macro) == Lisp_String &&
      XSTRING (Vexecuting_macro)->size == 1) ||
     (XTYPE (Vexecuting_macro) == Lisp_Vector &&
      XVECTOR (Vexecuting_macro)->size == 1))))
    Vlast_command = Qt;