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patch 8.2.4673: redrawing a split window is slow when using CTRL-F and CTRL-B

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Problem:    Redrawing a vertically split window is slow when using CTRL-F and
            CTRL-B.
Solution:   When deciding on USE_REDRAW bail out if scrolling more than three
            lines. (issue #8002)
This commit is contained in:
Bram Moolenaar 2022-04-03 13:23:22 +01:00
parent ce416b453a
commit 8ef6997e2d
2 changed files with 19 additions and 1 deletions
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18
src/screen.c
View File

@ -3707,7 +3707,15 @@ screen_ins_lines(
*/
result_empty = (row + line_count >= end);
if (wp != NULL && wp->w_width != Columns && *T_CSV == NUL)
{
// Avoid that lines are first cleared here and then redrawn, which
// results in many characters updated twice. This happens with CTRL-F
// in a vertically split window. With line-by-line scrolling
// USE_REDRAW should be faster.
if (line_count > 3)
return FAIL;
type = USE_REDRAW;
}
else if (can_clear(T_CD) && result_empty)
type = USE_T_CD;
else if (*T_CAL != NUL && (line_count > 1 || *T_AL == NUL))
@ -3879,7 +3887,7 @@ screen_del_lines(
int end,
int force, // even when line_count > p_ttyscroll
int clear_attr, // used for clearing lines
win_T *wp UNUSED) // NULL or window to use width from
win_T *wp) // NULL or window to use width from
{
int j;
int i;
@ -3934,7 +3942,15 @@ screen_del_lines(
* 6. redraw the characters from ScreenLines[].
*/
if (wp != NULL && wp->w_width != Columns && *T_CSV == NUL)
{
// Avoid that lines are first cleared here and then redrawn, which
// results in many characters updated twice. This happens with CTRL-F
// in a vertically split window. With line-by-line scrolling
// USE_REDRAW should be faster.
if (line_count > 3)
return FAIL;
type = USE_REDRAW;
}
else if (can_clear(T_CD) && result_empty)
type = USE_T_CD;
else if (row == 0 && (

2
src/version.c
View File

@ -750,6 +750,8 @@ static char *(features[]) =
static int included_patches[] =
{ /* Add new patch number below this line */
/**/
4673,
/**/
4672,
/**/