vim-patch:8.1.0372: screen updating slow when 'cursorline' is set (#8986)

Problem:    Screen updating slow when 'cursorline' is set.
Solution:   Only redraw the old and new cursor line, not all lines.
https://github.com/vim/vim/commit/90a997987dbbe43af3c15118a35f658f0f037d1d

1 files changed, 9 insertions, 7 deletions

diff --git a/src/nvim/edit.c b/src/nvim/edit.c
index d0994d35f5..d29ea7f164 100644
--- a/src/nvim/edit.c
+++ b/src/nvim/edit.c
@@ -1534,12 +1534,14 @@ void edit_putchar(int c, int highlight)
 void edit_unputchar(void)
 {
   if (pc_status != PC_STATUS_UNSET && pc_row >= msg_scrolled) {
-    if (pc_status == PC_STATUS_RIGHT)
-      ++curwin->w_wcol;
-    if (pc_status == PC_STATUS_RIGHT || pc_status == PC_STATUS_LEFT)
-      redrawWinline(curwin->w_cursor.lnum, FALSE);
-    else
+    if (pc_status == PC_STATUS_RIGHT) {
+      curwin->w_wcol++;
+    }
+    if (pc_status == PC_STATUS_RIGHT || pc_status == PC_STATUS_LEFT) {
+      redrawWinline(curwin, curwin->w_cursor.lnum, false);
+    } else {
       screen_puts(pc_bytes, pc_row - msg_scrolled, pc_col, pc_attr);
+    }
   }
 }
 
@@ -1576,7 +1578,7 @@ static void undisplay_dollar(void)
 {
   if (dollar_vcol >= 0) {
     dollar_vcol = -1;
-    redrawWinline(curwin->w_cursor.lnum, FALSE);
+    redrawWinline(curwin, curwin->w_cursor.lnum, false);
   }
 }
 
@@ -5909,7 +5911,7 @@ static void check_spell_redraw(void)
     linenr_T lnum = spell_redraw_lnum;
 
     spell_redraw_lnum = 0;
-    redrawWinline(lnum, FALSE);
+    redrawWinline(curwin, lnum, false);
   }
 }