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bug#11210: Windows emacs 23.4.1: scroll-conservatively > 0 results in mu

From: Bill Meier
Subject: bug#11210: Windows emacs 23.4.1: scroll-conservatively > 0 results in multiple cursors being displayed after scrolling
Date: Tue, 10 Apr 2012 17:37:13 -0400
User-agent: Mozilla/5.0 (Windows NT 6.1; rv:11.0) Gecko/20120327 Thunderbird/11.0.1

Ok: To answer various comments/questions in 1 EMail (and to summarize)_

Could you perhaps try the latest pretest of Emacs 24.1, which is
available from here:


Same effect.

Summary: OK in 23.3; NG in 23.4 & 24.0.95

6. If an EMacs frame is showing multiple EMacs windows, no cursor
     appears in the non-selected EMacs window.

You mean, there's no empty rectangle in the non-selected windows?  Do
you _ever_ see a cursor in non-selected windows on this system?


Note: This might (or might not) be a different unrelated problem. I've just realized that this is true for my Emacs 23.3 also.

Also, as noted, changing cursor configuration (e.g., "blinking cursor") has no apparent effect.

If others using Windows 7 do see an empty rectangle in non-selected windows and/or are able to change the cursor config from within Emacs, then obviously there's something special/different about my configuration.

>> abc
>> 123
>> |
>> Strange ....
> Probably because of the different dimensions of the letters and the
> digits.
> If you go to one of the 'a' characters and type "C-u C-x =", what font
> does Emacs show as being used for this character?  Please also do the
> same for '1' and see what it says then.

Actually: I see the same problem using 'def' (or seemingly any set of characters) instead of '123'. :)

        character: a (97, #o141, #x61)
preferred charset: ascii (ASCII (ISO646 IRV))
       code point: 0x61
           syntax: w    which means: word
         category: .:Base, a:ASCII, l:Latin, r:Roman
      buffer code: #x61
        file code: #x61 (encoded by coding system utf-8-dos)
          display: by this font (glyph code)
uniscribe:-outline-Courier New-normal-normal-normal-mono-13-*-*-*-c-*-iso8859-1 (#x44)

Character code properties: customize what to show
  general-category: Ll (Letter, Lowercase)

There are text properties here:
  fontified            t


The problem seems very "phase of the moon" related.

Only happens some fraction of the time (i.e. not on every down-arrow past the end of the buffer).

Seems definitely dependent upon the contents of the buffer.

I even got a fail (artifacts) once (even with scroll-conservatively set to 0) with a 24 line screen and a buffer of 50 lines of 'abc' and just repeatedly doing M-S-< followed by M-S-> .


My comment: maybe let this simmer for a while and see if anyone else reports a similar issue (or eventually decide the issue is something about my system).

(It's not the end of the world for me to run emacs with
'scroll-conservatively= 0')


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