vim-patch:8.2.3609: internal error when ModeChanged is triggered recursively

Problem:    Internal error when ModeChanged is triggered when v:event is
            already in use.
Solution:   Save and restore v:event if needed.
https://github.com/vim/vim/commit/3075a45592fe76f2febb6321632a23e352efe949

In the vim codebase there is no occurrence of get_vim_var_dict(VV_EVENT)
after the above patch, so in order to hold the same invariant in the
neovim codebase we needed to replace more occurrences than the related
vim patch.

1 files changed, 3 insertions, 2 deletions

diff --git a/src/nvim/file_search.c b/src/nvim/file_search.c
index 36257fefb3..fe991963a0 100644
--- a/src/nvim/file_search.c
+++ b/src/nvim/file_search.c
@@ -1603,7 +1603,8 @@ void do_autocmd_dirchanged(char *new_dir, CdScope scope, CdCause cause)
 
   recursive = true;
 
-  dict_T *dict = get_vim_var_dict(VV_EVENT);
+  save_v_event_T save_v_event;
+  dict_T *dict = get_v_event(&save_v_event);
   char buf[8];
 
   switch (scope) {
@@ -1648,7 +1649,7 @@ void do_autocmd_dirchanged(char *new_dir, CdScope scope, CdCause cause)
   apply_autocmds(EVENT_DIRCHANGED, (char_u *)buf, (char_u *)new_dir, false,
                  curbuf);
 
-  tv_dict_clear(dict);
+  restore_v_event(dict, &save_v_event);
 
   recursive = false;
 }