vim-patch:partial:9.0.0913: only change in current window triggers the WinScrolled event

Problem:    Only a change in the current window triggers the WinScrolled
            event.
Solution:   Trigger WinScrolled if any window scrolled or changed size.
            (issue vim/vim#11576)

0a60f79fd0

Skip locking of window layout and E1312.
Copy the latest version of all WinScrolled tests from Vim.
Note: patch 9.0.0915 is needed for the Lua tests to pass.

Co-authored-by: Bram Moolenaar <Bram@vim.org>

src/nvim/normal.c

@@ -1397,6 +1397,9 @@ static int normal_check(VimState *state)
       fclose(time_fd);
       time_fd = NULL;
     }
+    // After the first screen update may start triggering WinScrolled
+    // autocmd events.  Store all the scroll positions and sizes now.
+    may_make_initial_scroll_size_snapshot();
   }
 
   // May perform garbage collection when waiting for a character, but