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From: Alan Mackenzie <acm@muc.de>
To: Allen Li <darkfeline@felesatra.moe>, Eli Zaretskii <eliz@gnu.org>
Cc: 32848@debbugs.gnu.org, Anders Lindgren <andlind@gmail.com>
Subject: bug#32848: 26.1; follow-mode cursor move breaks with frame-resize-pixelwise
Date: Sun, 30 Sep 2018 11:02:15 +0000	[thread overview]
Message-ID: <20180930110215.GA6305@ACM> (raw)
In-Reply-To: <8336tv8iv7.fsf@gnu.org>

Hello, Allen and Eli.

I've just committed the following change to the emacs-26 branch.  It is
a workaround, but is safe, and should enable you (Allen) to carry on
using follow mode.

Eli and I have a more satisfactory fix planned for master.



diff --git a/lisp/follow.el b/lisp/follow.el
index fd397c077b..7942901bb4 100644
--- a/lisp/follow.el
+++ b/lisp/follow.el
@@ -438,7 +438,10 @@ follow-mode
         (setq pos-visible-in-window-group-p-function
               'follow-pos-visible-in-window-p)
         (setq selected-window-group-function 'follow-all-followers)
-        (setq move-to-window-group-line-function 'follow-move-to-window-line))
+        (setq move-to-window-group-line-function 'follow-move-to-window-line)
+
+        ;; Crude workaround for bug #32848 for the emacs-26 branch, 2018-09-30.
+        (setq-local make-cursor-line-fully-visible nil))
 
     ;; Remove globally-installed hook functions only if there is no
     ;; other Follow mode buffer.
@@ -451,6 +454,9 @@ follow-mode
 	(remove-hook 'post-command-hook 'follow-post-command-hook)
 	(remove-hook 'window-size-change-functions 'follow-window-size-change)))
 
+    ;; Second part of crude workaround for bug #32848.
+    (kill-local-variable 'make-cursor-line-fully-visible)
+
     (kill-local-variable 'move-to-window-group-line-function)
     (kill-local-variable 'selected-window-group-function)
     (kill-local-variable 'pos-visible-in-window-group-p-function)

-- 
Alan Mackenzie (Nuremberg, Germany).



On Thu, Sep 27, 2018 at 11:06:20 +0300, Eli Zaretskii wrote:
> > From: Allen Li <darkfeline@felesatra.moe>
> > Date: Wed, 26 Sep 2018 15:49:15 -0700

> > Moving the cursor off the bottom of the window with follow-mode enabled
> > doesn't move to the other window properly if frame-resize-pixelwise is
> > set and a partial line is visible.

> It seems like setting make-cursor-line-fully-visible to nil solves the
> problem.  Could you try that for a while, and see if this has any
> adverse effects?

> Alan and Anders: does setting this variable to nil in buffers under
> follow-mode sounds like an okay solution?  It might mean that in some
> rare cases the user will see the current line only partially (only in
> the last window in the group).  If you think this is OK, we could
> arrange for that variable to be set locally as part of turning on
> follow-mode.

> A more complex solution would be to allow
> make-cursor-line-fully-visible have a value that is a function, which
> follow-mode will define in a way that will only allow
> partially-visible current line in a window if it is not the last one
> in the order returned by follow-all-followers.

> Comments?





  parent reply	other threads:[~2018-09-30 11:02 UTC|newest]

Thread overview: 29+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-09-26 22:49 bug#32848: 26.1; follow-mode cursor move breaks with frame-resize-pixelwise Allen Li
2018-09-27  6:04 ` Eli Zaretskii
2018-09-27  8:06 ` Eli Zaretskii
2018-09-28 20:31   ` Alan Mackenzie
2018-09-28 21:27     ` Eli Zaretskii
2018-09-29  8:35       ` Alan Mackenzie
2018-09-29 10:26         ` Eli Zaretskii
2018-09-29 11:25           ` Alan Mackenzie
2018-09-29 13:47             ` Eli Zaretskii
2018-09-29 13:56               ` Eli Zaretskii
2018-09-29 14:48               ` Alan Mackenzie
2018-09-29 15:06                 ` Eli Zaretskii
2018-09-29 20:25                   ` Alan Mackenzie
2018-09-30  5:30                     ` Eli Zaretskii
2018-09-30 11:16                       ` Eli Zaretskii
2018-09-30 12:16                         ` Alan Mackenzie
2018-09-30 12:56                           ` Eli Zaretskii
2018-09-30 14:09                             ` Alan Mackenzie
2018-09-30 17:00                               ` Eli Zaretskii
2018-10-01 12:33                                 ` Alan Mackenzie
2018-10-01 13:47                                   ` Eli Zaretskii
2018-10-15  9:23                                     ` Alan Mackenzie
2018-10-15 15:07                                       ` Eli Zaretskii
2018-10-15 17:26                                         ` Alan Mackenzie
2018-10-15 18:02                                           ` Eli Zaretskii
2018-09-30 11:02   ` Alan Mackenzie [this message]
2018-09-30 11:24     ` Eli Zaretskii
2018-09-30 13:55       ` Alan Mackenzie
2018-10-17 10:17   ` Alan Mackenzie

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