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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 11:42:01 -0400
User-agent: Mozilla/5.0 (Windows NT 6.1; rv:11.0) Gecko/20120327 Thunderbird/11.0.1

On 4/10/2012 3:26 AM, Eli Zaretskii wrote:
Date: Mon, 09 Apr 2012 18:38:28 -0400
From: Bill Meier<address@hidden>

I cannot reproduce this on my Windows XP box.  I see no artifacts at
all left after scrolling.

Do you perhaps have ClearType enabled?


If so, does the problem go
away when you disable it?


Additional info (which may or may not be relevant)

Note, in all cases below, I create an artifact by hitting down-arrow at the bottom of the screen (with scroll-conservatively > 0) until I get
a case where the cursor (aka artifact) shows (not blinking) at line N-1
with a blinking cursor at line N.

1. Minimize/Restore of the w32 window (aka EMacs "frame") clears the
2. Cover/Uncover of the w32 window (EMacs) with another w32 window
   does not clear the artifacts;
3. Hitting up-arrow puts the blinking cursor at line N-1.
   Then hitting down-arrow puts the blinking cursor back at line N.
   The cursor/artifact remains at line N-1 (not blinking).
4. If, after an artifact appears on a line, I scroll up a line
   (M-1 C-V) the artifact moves with the line.
5. If cursor is at column N (and at the bottow row (Line N) of the text
   on the screen), then after hitting down-arrow, if the
   artifact appears on the line just scrolled up it will be
   at column N.


6. If an EMacs frame is showing multiple EMacs windows, no cursor
   appears in the non-selected EMacs window.
7. Changing a cursor setting (blink-cursor-mode, blink-cursor-interval)
   doen't seem to actually affect the cursor.

If there's anything I can do to help with debugging, please let me know.

(Just for the record, I'm running Windows 7 Ultimate, Service Pack #1 with up-to-date patches).

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