patch 8.2.4644: redrawing too often when 'relativenumber' is set
Problem: Redrawing too often when 'relativenumber' is set.
Solution: Only redraw when the cursor line changed. (Lewis Russell,
closes #10040)
diff --git a/src/drawscreen.c b/src/drawscreen.c
index cb47577..9f9cb09 100644
--- a/src/drawscreen.c
+++ b/src/drawscreen.c
@@ -2507,11 +2507,11 @@
}
else
{
- if (wp->w_p_rnu)
+ if (wp->w_p_rnu && wp->w_last_cursor_lnum_rnu != wp->w_cursor.lnum)
{
#ifdef FEAT_FOLDING
- // 'relativenumber' set: The text doesn't need to be drawn, but
- // the number column nearly always does.
+ // 'relativenumber' set and the cursor moved vertically: The
+ // text doesn't need to be drawn, but the number column does.
fold_count = foldedCount(wp, lnum, &win_foldinfo);
if (fold_count != 0)
fold_line(wp, fold_count, &win_foldinfo, lnum, row);
@@ -2553,6 +2553,7 @@
// update w_last_cursorline.
wp->w_last_cursorline = wp->w_p_cul ? wp->w_cursor.lnum : 0;
#endif
+ wp->w_last_cursor_lnum_rnu = wp->w_p_rnu ? wp->w_cursor.lnum : 0;
#ifdef FEAT_VTP
// Rewrite the character at the end of the screen line.