Re: [emacs-bidi] Incorrect cursor display for BN characters at EOL

[Larry Denenberg]

>>   hello RET RET RET RET RET abc RET def ^P ^E ^Q <delete>
>> 
>> [Digression:  Why does the ^P here put the cursor after the "a" rather
>> than after the "c", as I expect?  This is an Aquamacs, not bidi, thing.]

[A typo in this digression has been corrected.]

A lucky miskeying just tipped me off that this is Aquamacs intended
behavior.  I accidentally put "ddf" in the second line instead of "def",
after which ^P puts me after the "b" instead of the "a"!  I figured out
that ^P is in certain modes rebound to aquamacs-previous-line, which
tries to move visually, taking variable-width characters into account.
I submit that it's doing an awfully poor job here, but what the hey.
Disconcerting, but easy to turn off.  So this part is settled.


>In any case, please describe the display after all this input.

I believe the display is correct:  I see "hello" at the top, followed by
several blank lines, followed by a line containing "abc^?", followed by
a line containing "def".  The minibuffer contains "^Q backspace".  But
the blinking cursor is after the "o" of "hello", not after the "^?".

I realized after posting that the subject line should speak of cursor
*display*, not cursor *positioning*.  Changed.


>I cannot reproduce this with the current development sources.  When
>was your Emacs checked out and built?

I did not build this Emacs myself, but downloaded it from the nightly
build of Aquamacs 2.x (Emacs 24, Cocoa-based, "aquamacs24" branch) at
http://aquamacs.org/nightlies.shtml on June 21.  The complete output of
send-emacs-bug-report is appended, including keystrokes from startup.

For the record, I discovered this in the course of reporting an Aquamacs
bug concerning A-backspace; that report was submitted to
address@hidden  I teased out the problem described here,
which occurs only with bidi active, and simplified it by using backspace
rather than A-backspace (both have bidi-class BN).  Sounds like another
Aquamacs-only thing.  I do get the same behavior when starting with
"-Q", which supposed disables most Aquamacs-specific parts.


>> (BTW, it would be nice for this variable's doc to start with an asterisk
>> so you could set it with M-x set-variable.)
>
>Sorry, I don't want to do this.  bidi-display-reordering is an
>internal variable, not something I'd like users to play with at will.

In that case, perhaps for consistency you should remove the asterisk
from bidi-paragraph-direction (which *is* visible to M-x set-variable).

/Larry Denenberg
address@hidden
http://larry.denenberg.com/

===========================================

In GNU Emacs 24.0.50.1 (i386-apple-darwin9.8.0, NS apple-appkit-949.54)
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