non-manual foldmethod makes botline incorrect in decoration provider during :edit-ing existing buffer about neovim

[tomtomjhj]

This fixes this issue.

diff --git a/src/nvim/window.c b/src/nvim/window.c
index 8232767e2..1a6c3f726 100644
--- a/src/nvim/window.c
+++ b/src/nvim/window.c
@@ -2467,6 +2467,7 @@ void win_init_empty(win_T *wp)
   wp->w_topline = 1;
   wp->w_topfill = 0;
   wp->w_botline = 2;
+  wp->w_valid = 0;
   wp->w_s = &wp->w_buffer->b_s;
 }
 

win_init_empty is invoked for the current existing window when running :edit, whose w_valid may have VALID_BOTLINE. Resetting w_botline without marking it as invalid makes validate_botline in decor_providers_invoke_win no-op, resulting in wrong botline in on_win.

Vim has the same issue. I'll send a patch to Vim.

[tomtomjhj]

Fixed by #28530