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Fix 'recenter' when visual-line-mode is turned on

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* src/window.c (Frecenter): Use the same code for GUI and TTY
frames alike; use vmotion only for "initial" frames.  This is
because vmotion doesn't support visual-line-mode.  Rewrite the
'iarg >= 0' case to use move_it_* functions instead of using
vmotion, for the same reason.  Fix the clipping of the argument
value to support scroll-margin in all cases and avoid unwarranted
recentering.  Reported by Milan Stanojević <milanst@gmail.com> in
http://lists.gnu.org/archive/html/help-gnu-emacs/2015-04/msg00092.html,
which see.
This commit is contained in:
Eli Zaretskii 2015-04-10 13:09:42 +03:00
parent 3638632f0b
commit 5aed69af5e
1 changed files with 31 additions and 10 deletions
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41
src/window.c
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@ -5799,10 +5799,9 @@ and redisplay normally--don't erase and redraw the frame. */)
this_scroll_margin
= max (0, min (scroll_margin, w->total_lines / 4));
/* Handle centering on a graphical frame specially. Such frames can
have variable-height lines and centering point on the basis of
line counts would lead to strange effects. */
if (FRAME_WINDOW_P (XFRAME (w->frame)))
/* Don't use redisplay code for initial frames, as the necessary
data structures might not be set up yet then. */
if (!FRAME_INITIAL_P (XFRAME (w->frame)))
{
if (center_p)
{
@ -5824,9 +5823,11 @@ and redisplay normally--don't erase and redraw the frame. */)
ptrdiff_t nlines = min (PTRDIFF_MAX, -iarg);
int extra_line_spacing;
int h = window_box_height (w);
int ht = window_internal_height (w);
void *itdata = bidi_shelve_cache ();
iarg = - max (-iarg, this_scroll_margin);
nlines = clip_to_bounds (this_scroll_margin + 1, nlines,
ht - this_scroll_margin);
SET_TEXT_POS (pt, PT, PT_BYTE);
start_display (&it, w, pt);
@ -5890,13 +5891,33 @@ and redisplay normally--don't erase and redraw the frame. */)
}
else
{
struct position pos;
struct it it;
struct text_pos pt;
ptrdiff_t nlines = min (PTRDIFF_MAX, iarg);
int ht = window_internal_height (w);
void *itdata = bidi_shelve_cache ();
iarg = max (iarg, this_scroll_margin);
nlines = clip_to_bounds (this_scroll_margin, nlines,
ht - this_scroll_margin - 1);
pos = *vmotion (PT, PT_BYTE, -iarg, w);
charpos = pos.bufpos;
bytepos = pos.bytepos;
SET_TEXT_POS (pt, PT, PT_BYTE);
start_display (&it, w, pt);
/* Move to the beginning of screen line containing PT. */
move_it_by_lines (&it, 0);
/* Move back to find the point which is ARG screen lines above PT. */
if (nlines > 0)
{
it.current_y = 0;
it.vpos = 0;
move_it_by_lines (&it, -nlines);
}
charpos = IT_CHARPOS (it);
bytepos = IT_BYTEPOS (it);
bidi_unshelve_cache (itdata, 0);
}
}
else