vim-patch:8.1.0374: moving the cursor is slow when 'relativenumber' is set

Problem:    Moving the cursor is slow when 'relativenumber' is set.
Solution:   Only redraw the number column, not all lines.
https://github.com/vim/vim/commit/bd9a53c06c8869ad811cb3dd01a309c9be7d7a63

1 files changed, 15 insertions, 9 deletions

diff --git a/src/nvim/move.c b/src/nvim/move.c
index 9dccca092a..4a2874abeb 100644
--- a/src/nvim/move.c
+++ b/src/nvim/move.c
@@ -104,17 +104,23 @@ static void redraw_for_cursorline(win_T *wp)
   if ((wp->w_p_rnu || wp->w_p_cul)
       && (wp->w_valid & VALID_CROW) == 0
       && !pum_visible()) {
-    if (!wp->w_p_rnu && wp->w_redr_type <= VALID && last_cursorline != 0) {
-      // "last_cursorline" may be set for another window, worst case we
-      // redraw too much.  This is optimized for moving the cursor around
-      // in the same window.
-      redrawWinline(wp, last_cursorline, false);
-      redrawWinline(wp, wp->w_cursor.lnum, false);
+    if (wp->w_p_rnu) {
+      // win_line() will redraw the number column only.
       redraw_win_later(wp, VALID);
-    } else {
-      redraw_win_later(wp, SOME_VALID);
     }
-    last_cursorline = wp->w_cursor.lnum;
+    if (wp->w_p_cul) {
+      if (wp->w_redr_type <= VALID && last_cursorline != 0) {
+        // "last_cursorline" may be set for another window, worst case
+        // we redraw too much.  This is optimized for moving the cursor
+        // around in the same window.
+        redrawWinline(wp, last_cursorline, false);
+        redrawWinline(wp, wp->w_cursor.lnum, false);
+        redraw_win_later(wp, VALID);
+      } else {
+        redraw_win_later(wp, SOME_VALID);
+      }
+      last_cursorline = wp->w_cursor.lnum;
+    }
   }
 }