GNU bug report logs - #70038
29.3.50; Shift up/down in buffer with images on M-x other-window with some fonts

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From: martin rudalics <rudalics <at> gmx.at>
To: Eli Zaretskii <eliz <at> gnu.org>
Cc: luangruo <at> yahoo.com, 70038 <at> debbugs.gnu.org
Subject: bug#70038: 29.3.50; Shift up/down in buffer with images on M-x other-window with some fonts
Date: Sun, 14 Apr 2024 10:31:15 +0200

> The (slight) harm this does is that it might make redisplay of the
> window slightly more expensive, because it disables some
> optimizations, like if nothing changed except the position of point.
> Another kind of harm is what triggered this bug report: it could cause
> us to reset the window's vscroll for now good reason, because when
> start positions are frozen, we set the window's force_start flag, and
> that sometimes forces us to reset vscroll.

From looking at the code it's hard to understand what you say here.  It
might be a good idea to add this as a comment.

> So the patch below is the only change we need to make sure the frame's
> frozen_window_starts is reset when the mini-window is resized back?

Probably not.  If 'resize-mini-windows' is t, we never unfreeze window
starts because we don't call shrink_mini_window in that case.

> Should it matter whether, if the minibuffer is active, we do that only
> at the outer level of minibuffer?

It shouldn't.  Window starts would be frozen immediately as soon as the
mini window grows again.  I think that to cover most cases we should
unfreeze window starts every time the mini window gets smaller as in the
patch below.

diff --git a/src/window.c b/src/window.c
index fe26311fbb2..9c8fc12ee3e 100644
--- a/src/window.c
+++ b/src/window.c
@@ -5376,7 +5376,8 @@ grow_mini_window (struct window *w, int delta)
       struct window *r = XWINDOW (root);
       Lisp_Object grow;

-      FRAME_WINDOWS_FROZEN (f) = true;
+      FRAME_WINDOWS_FROZEN (f) = (delta > 0) ? true : false;
+
       grow = call3 (Qwindow__resize_root_window_vertically,
 		    root, make_fixnum (- delta), Qt);

martin

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