Commit: patch 9.1.0380: Calculating line height for unnecessary amount of lines

[Christian Brabandt]

patch 9.1.0380: Calculating line height for unnecessary amount of lines

Commit: https://github.com/vim/vim/commit/32d701f51b1ed2834071a2c5031a300936beda13
Author: Luuk van Baal <luuk...@gmail.com>
Date: Sun Apr 28 16:24:02 2024 +0200

patch 9.1.0380: Calculating line height for unnecessary amount of lines

Problem: Calculating line height for unnecessary amount of lines with
half-page scrolling (zhscn, after 9.1.0280)
Solution: Replace "limit_winheight" argument with higher resolution
"max" argument to which to limit the calculated line height
in plines_m_win() to (Luuk van Baal)

fixes: #14650
closes: #14652

Signed-off-by: Luuk van Baal <luuk...@gmail.com>
Signed-off-by: Christian Brabandt <c...@256bit.org>

diff --git a/src/drawscreen.c b/src/drawscreen.c
index f8818ff1a..9096c28df 100644
--- a/src/drawscreen.c
+++ b/src/drawscreen.c
@@ -1781,7 +1781,7 @@ win_update(win_T *wp)
if (j < wp->w_height - 2) // not too far off
{
i = plines_m_win(wp, wp->w_topline, wp->w_lines[0].wl_lnum - 1,
- TRUE);
+ wp->w_height);
#ifdef FEAT_DIFF
// insert extra lines for previously invisible filler lines
if (wp->w_lines[0].wl_lnum != wp->w_topline)
diff --git a/src/misc1.c b/src/misc1.c
index c5a0c3852..834848886 100644
--- a/src/misc1.c
+++ b/src/misc1.c
@@ -497,12 +497,17 @@ plines_win_col(win_T *wp, linenr_T lnum, long column)
return lines;
}

+/*
+ * Return number of window lines the physical line range from "first" until
+ * "last" will occupy in window "wp". Takes into account folding, 'wrap',
+ * topfill and filler lines beyond the end of the buffer. Limit to "max" lines.
+ */
int
-plines_m_win(win_T *wp, linenr_T first, linenr_T last, int limit_winheight)
+plines_m_win(win_T *wp, linenr_T first, linenr_T last, int max)
{
int count = 0;

- while (first <= last && (!limit_winheight || count < wp->w_height))
+ while (first <= last && count < max)
{
#ifdef FEAT_FOLDING
int x;
@@ -531,9 +536,7 @@ plines_m_win(win_T *wp, linenr_T first, linenr_T last, int limit_winheight)
if (first == wp->w_buffer->b_ml.ml_line_count + 1)
count += diff_check_fill(wp, first);
#endif
- if (limit_winheight && count > wp->w_height)
- return wp->w_height;
- return (count);
+ return MIN(max, count);
}

int
diff --git a/src/move.c b/src/move.c
index 1b6e003cc..9bdd46f2c 100644
--- a/src/move.c
+++ b/src/move.c
@@ -1455,7 +1455,7 @@ textpos2screenpos(

is_folded = hasFoldingWin(wp, lnum, &lnum, NULL, TRUE, NULL);
#endif
- row = plines_m_win(wp, wp->w_topline, lnum - 1, FALSE);
+ row = plines_m_win(wp, wp->w_topline, lnum - 1, INT_MAX);
// "row" should be the screen line where line "lnum" begins, which can
// be negative if "lnum" is "w_topline" and "w_skipcol" is non-zero.
row -= adjust_plines_for_skipcol(wp);
@@ -3219,12 +3219,18 @@ pagescroll(int dir, long count, int half)

int curscount = count;
// Adjust count so as to not reveal end of buffer lines.
- if (dir == FORWARD)
+ if (dir == FORWARD
+ && (curwin->w_topline + curwin->w_height + count > buflen
+#ifdef FEAT_FOLDING
+ || hasAnyFolding(curwin)
+#endif
+ ))
{
int n = plines_correct_topline(curwin, curwin->w_topline, FALSE);
if (n - count < curwin->w_height && curwin->w_topline < buflen)
- n += plines_m_win(curwin, curwin->w_topline + 1, buflen, FALSE);
- if (n - count < curwin->w_height)
+ n += plines_m_win(curwin, curwin->w_topline + 1, buflen,
+ curwin->w_height + count);
+ if (n < curwin->w_height + count)
count = n - curwin->w_height;
}

diff --git a/src/popupwin.c b/src/popupwin.c
index 25bb15349..38c1c9e0d 100644
--- a/src/popupwin.c
+++ b/src/popupwin.c
@@ -654,8 +654,8 @@ popup_show_curline(win_T *wp)
wp->w_topline = wp->w_buffer->b_ml.ml_line_count;
while (wp->w_topline < wp->w_cursor.lnum
&& wp->w_topline < wp->w_buffer->b_ml.ml_line_count
- && plines_m_win(wp, wp->w_topline, wp->w_cursor.lnum, FALSE)
- > wp->w_height)
+ && plines_m_win(wp, wp->w_topline, wp->w_cursor.lnum,
+ wp->w_height + 1) > wp->w_height)
++wp->w_topline;
}

diff --git a/src/proto/misc1.pro b/src/proto/misc1.pro
index e76bf75d0..d64f961f0 100644
--- a/src/proto/misc1.pro
+++ b/src/proto/misc1.pro
@@ -7,7 +7,7 @@ int plines_nofill(linenr_T lnum);
int plines_win_nofill(win_T *wp, linenr_T lnum, int limit_winheight);
int plines_win_nofold(win_T *wp, linenr_T lnum);
int plines_win_col(win_T *wp, linenr_T lnum, long column);
-int plines_m_win(win_T *wp, linenr_T first, linenr_T last, int limit_winheight);
+int plines_m_win(win_T *wp, linenr_T first, linenr_T last, int max);
int gchar_pos(pos_T *pos);
int gchar_cursor(void);
void pchar_cursor(int c);
diff --git a/src/version.c b/src/version.c
index 0f665efd6..107039fad 100644
--- a/src/version.c
+++ b/src/version.c
@@ -704,6 +704,8 @@ static char *(features[]) =

static int included_patches[] =
{ /* Add new patch number below this line */
+/**/
+ 380,
/**/
379,
/**/