vim-patch:9.2.0430: tests: Test_shortmess_F3() is flaky on MS-Windows

Problem:  tests: Test_shortmess_F3() is flaky on MS-Windows
Solution: Increase the sleep to 3s (Yasuhiro Matsumoto)

On MS-Windows time_differs() treats mtime as unchanged unless st_mtime
differs by more than 1 second, so a 2-second sleep can fall short when
the two writes straddle a second boundary. Bump the non-nanotime sleep
to 3 seconds.

closes: vim/vim#20117

2219c89013

Co-authored-by: Yasuhiro Matsumoto <mattn.jp@gmail.com>

test/old/testdir/test_options.vim

@@ -1400,7 +1400,7 @@ func Test_shortmess_F3()
   if has('nanotime')
     sleep 10m
   else
-    sleep 2
+    sleep 3
   endif
   call writefile(['bar'], 'X_dummy')
   bprev
@@ -1410,7 +1410,7 @@ func Test_shortmess_F3()
   if has('nanotime')
     sleep 10m
   else
-    sleep 2
+    sleep 3
   endif
   call writefile(['baz'], 'X_dummy')
   checktime