vim-patch:8.2.4713: plugins cannot track text scrolling

Problem:    Plugins cannot track text scrolling.
Solution:   Add the WinScrolled event. (closes vim/vim#10102)
https://github.com/vim/vim/commit/0937182d49fa8db50cec42785f22f1031760a0bd

Skip User event in autocmd.txt, not needed unless #10689 is reverted.

1 files changed, 6 insertions, 6 deletions

diff --git a/src/nvim/normal.c b/src/nvim/normal.c
index dcfd73a631..5b3f27529c 100644
--- a/src/nvim/normal.c
+++ b/src/nvim/normal.c
@@ -1223,10 +1223,9 @@ static void normal_check_interrupt(NormalState *s)
 
 static void normal_check_window_scrolled(NormalState *s)
 {
-  // Trigger Scroll if the viewport changed.
-  if (!finish_op && has_event(EVENT_WINSCROLLED)
-      && win_did_scroll(curwin)) {
-    do_autocmd_winscrolled(curwin);
+  if (!finish_op) {
+    // Trigger Scroll if the viewport changed.
+    may_trigger_winscrolled(curwin);
   }
 }
 
@@ -1353,9 +1352,10 @@ static int normal_check(VimState *state)
   if (skip_redraw || exmode_active) {
     skip_redraw = false;
   } else if (do_redraw || stuff_empty()) {
-    // Need to make sure w_topline and w_leftcol are correct before
-    // normal_check_window_scrolled() is called.
+    // Ensure curwin->w_topline and curwin->w_leftcol are up to date
+    // before triggering a WinScrolled autocommand.
     update_topline(curwin);
+    validate_cursor();
 
     normal_check_cursor_moved(s);
     normal_check_text_changed(s);