vim-patch:9.1.0759: screenpos() may return invalid position (#30681)

Problem:  screenpos() may return invalid position
          after switching buffers (Greg Hurrell)
Solution: reset w_leftcol if wrapping has been set
          after copying wrap option

fixes: vim/vim#15792
closes: vim/vim#15803

https://github.com/vim/vim/commit/b065a10e245d020c11b521a2a5062300ca9891fc

Co-authored-by: Christian Brabandt <cb@256bit.org>

1 files changed, 6 insertions, 0 deletions

diff --git a/src/nvim/option.c b/src/nvim/option.c
index 72b633ceb2..aa6f330dfc 100644
--- a/src/nvim/option.c
+++ b/src/nvim/option.c
@@ -5096,6 +5096,12 @@ void clear_winopt(winopt_T *wop)
 
 void didset_window_options(win_T *wp, bool valid_cursor)
 {
+  // Set w_leftcol or w_skipcol to zero.
+  if (wp->w_p_wrap) {
+    wp->w_leftcol = 0;
+  } else {
+    wp->w_skipcol = 0;
+  }
   check_colorcolumn(wp);
   briopt_check(wp);
   fill_culopt_flags(NULL, wp);