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bug#23510: Strange redisplay in global highlighted mode moving the scrol

From: Stephen Berman
Subject: bug#23510: Strange redisplay in global highlighted mode moving the scroll bar
Date: Fri, 13 May 2016 19:52:56 +0200
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/25.1.50 (gnu/linux)

On Wed, 11 May 2016 12:44:43 +0300 Eli Zaretskii <address@hidden> wrote:

>> From: Stephen Berman <address@hidden>
>> Cc: "address@hidden" <address@hidden>,
>> address@hidden
>> Date: Wed, 11 May 2016 11:25:24 +0200
>> What you say about the use of pre- and post-command-hook and moving
>> overlays may well be (perhaps the main) part of the problem here, but I
>> found out that there's an specific condition inducing it: I noticed that
>> the flickering only happens when global-hl-line-mode is enabled, but not
>> when hl-line-mode is enabled, and it turns out that the crucial
>> difference between them is that in the former,
>> global-hl-line-sticky-flag is nil by default, while in the latter,
>> hl-line-sticky-flag is t by default: when I set
>> global-hl-line-sticky-flag to t and then enable global-hl-line-mode, the
>> flickering no longer happens, and when I set hl-line-sticky-flag to nil
>> and then enable hl-line-mode, the flickering does happen.
> If you can suggest a patch that fixes that and doesn't have any
> adverse effects, please do.

I have a patch, which I sent last night but it never arrived; I resent
it twice today, once from the same email address and once from a
different one, but neither of those have arrived, although other posts
have appeared in the list since my attempts were sent.  So this is just
a test to see if I can get through at all; if so, I'll try to see if I
can send the patch another way.

Steve Berman

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