patch 8.2.1183: assert_fails() checks the last error message
Problem: assert_fails() checks the last error message.
Solution: Check the first error, it is more relevant. Fix all the tests
that rely on the old behavior.
diff --git a/src/testdir/test_writefile.vim b/src/testdir/test_writefile.vim
index 9106f86..5c9e4b1 100644
--- a/src/testdir/test_writefile.vim
+++ b/src/testdir/test_writefile.vim
@@ -310,7 +310,7 @@
autocmd BufWritePre Xfile enew | write
augroup END
e Xfile
- call assert_fails('lockmarks write', 'E203:')
+ call assert_fails('lockmarks write', ['E32', 'E203:'])
augroup WriteTest
au!
augroup END