vim-patch:8.2.4343: when reloading not all properties are detected

Problem:    When reloading not all properties are detected.
Solution:   Add the "edit" value to v:fcs_choice. (Rob Pilling, closes vim/vim#9579)
8196e94a8b

Cherry-pick some test changes from patch 8.1.1826.

src/nvim/testdir/setup.vim

@@ -10,6 +10,7 @@ let s:did_load = 1
 set backspace=
 set directory^=.
 set fillchars=vert:\|,fold:-
+set fsync
 set laststatus=1
 set listchars=eol:$
 set joinspaces