--- Begin Message ---
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Subject: |
29.0.50; Cannot set vscroll when mini-window is resized |
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Date: |
Sun, 08 May 2022 19:53:10 +0800 |
It seems that this code in redisplay_window always clears out the
vscroll when the mini-window is taller than a single line of text:
/* If someone specified a new starting point but did not insist,
check whether it can be used. */
if ((w->optional_new_start || window_frozen_p (w))
&& CHARPOS (startp) >= BEGV
&& CHARPOS (startp) <= ZV)
{
ptrdiff_t it_charpos;
w->optional_new_start = false;
start_display (&it, w, startp);
move_it_to (&it, PT, 0, it.last_visible_y, -1,
MOVE_TO_POS | MOVE_TO_X | MOVE_TO_Y);
/* Record IT's position now, since line_bottom_y might change
that. */
it_charpos = IT_CHARPOS (it);
/* Make sure we set the force_start flag only if the cursor row
will be fully visible. Otherwise, the code under force_start
label below will try to move point back into view, which is
not what the code which sets optional_new_start wants. */
if ((it.current_y == 0 || line_bottom_y (&it) < it.last_visible_y)
&& !w->force_start)
{
if (it_charpos == PT)
w->force_start = true;
/* IT may overshoot PT if text at PT is invisible. */
else if (it_charpos > PT && CHARPOS (startp) <= PT)
w->force_start = true;
This can easily be reproduced by typing "M-x C-q C-j" and trying to use
`pixel-scroll-precision' with the mouse pointer on top of a window that
is not the `minibuf-scroll-window': the vscroll will not take effect,
since force_start will be set to true, and that resets the vscroll.
I think this "frozen" behavior is required to ensure that the start of
windows do not aimlessly move when the mini-window is being resized, but
it interferes with features that need to set the vscroll.
Any ideas?
Thanks in advance.
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--- Begin Message ---
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Subject: |
Re: bug#55312: 29.0.50; Cannot set vscroll when mini-window is resized |
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Date: |
Mon, 09 May 2022 09:38:46 +0800 |
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User-agent: |
Gnus/5.13 (Gnus v5.13) Emacs/28.0.91 (gnu/linux) |
Po Lu <luangruo@yahoo.com> writes:
> Thanks. I think I'd prefer the latter, and will begin working on it.
Now done, so I'm closing this bug report.
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