vim-patch:8.2.3946: when an internal error makes Vim exit the error is not seen

Problem:    When an internal error makes Vim exit the error is not seen.
Solution:   Add the error to the test output.
https://github.com/vim/vim/commit/1c67f3a9779b99bed7aacb3108abbb649445d3ed

Add emsg_not_now() check to make code equivalent.

2 files changed, 6 insertions, 0 deletions

diff --git a/src/nvim/message.c b/src/nvim/message.c
index 6cc68edb82..67b15e3e7d 100644
--- a/src/nvim/message.c
+++ b/src/nvim/message.c
@@ -830,8 +830,13 @@ static bool semsgv(const char *fmt, va_list ap)
 /// detected when fuzzing vim.
 void iemsg(const char *s)
 {
+  if (emsg_not_now()) {
+    return;
+  }
+
   emsg(s);
 #ifdef ABORT_ON_INTERNAL_ERROR
+  set_vim_var_string(VV_ERRMSG, s, -1);
   abort();
 #endif
 }
diff --git a/src/nvim/testdir/runtest.vim b/src/nvim/testdir/runtest.vim
index 6b16e888a9..fcd3d5724c 100644
--- a/src/nvim/testdir/runtest.vim
+++ b/src/nvim/testdir/runtest.vim
@@ -257,6 +257,7 @@ endfunc
 func EarlyExit(test)
   " It's OK for the test we use to test the quit detection.
   if a:test != 'Test_zz_quit_detected()'
+    call add(v:errors, v:errmsg)
     call add(v:errors, 'Test caused Vim to exit: ' . a:test)
   endif